diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..2237645
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 Rohith Reddy
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8020a0d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,54 @@
+# ✨ Publish NuGet
+GitHub action to build, pack & publish nuget pacakges automatically when a project version is updated
+
+## Usage
+Create a new `.github/workflows/publish-nuget.yml` file:
+
+```yaml
+name: publish to nuget
+on:
+  push:
+    branches:
+      - master # Your default release branch
+jobs:
+  publish:
+    name: publish to nuget
+    runs-on: ubuntu-latest
+    steps:
+      # Checkout
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 2 # This must be >= 2 to compare commits
+
+      # Optional step, add only for a specific dotnet version that doesn't come with ubuntu-latest
+      # For a list of software that comes pre-installed with ubuntu-latest visit bit.ly/2synnZl
+      # - name: Setup dotnet
+      #   uses: actions/setup-dotnet@v1
+      #   with:
+      #     dotnet-version: 3.1.100
+      
+      # Publish
+      - name: Publish if version is updated
+        uses: rohith/publish-nuget@v1
+        # with: # All inputs are optional (details given below)
+        #   project_dir: src # Defaults to repository root
+        #   tag_format: v* # [*] gets replaced with version
+        #   nuget_key: ${{secrets.NUGET_API_KEY}} # nuget.org API key
+```
+
+Project version updates are monitored on every push / PR merge to master & a new tag is created to denote the updated version. If a `nuget_key` is passed then the project gets built, packed & published to nuget.org
+
+## Inputs
+All these inputs are optional
+
+Input | Description
+--- | ---
+project_dir | Directory path containing the project file, defaults to repository root
+tag_format | Defaults to `v*` - `[*]` is a placeholder for the actual project version
+nuget_key | API key to authorize the package upload to nuget.org
+
+**Note:**  
+`project_dir` & `tag_format` have default values but a package cannot be published without the `nuget_key`
+
+## License
+[MIT](LICENSE)
\ No newline at end of file
diff --git a/action.yml b/action.yml
new file mode 100644
index 0000000..4df4a5c
--- /dev/null
+++ b/action.yml
@@ -0,0 +1,24 @@
+name: Publish NuGet
+author: Rohith Reddy (@rohith)
+description: Build, Pack & Publish NuGet packages with dotnet (.net core) on project version change
+
+inputs:
+    project_dir:
+        description: Project (csproj) directory path relative from the root of repository
+        required: false
+        default: .
+    tag_format:
+        description: Format of the tag to be created, `*` is placeholder for actual version
+        required: false
+        default: v*
+    nuget_key:
+        description: API key for the NuGet feed
+        required: false
+
+runs:
+    using: node12
+    main: index.js
+
+branding:
+    icon: package
+    color: blue
\ No newline at end of file
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..02fafcb
--- /dev/null
+++ b/index.js
@@ -0,0 +1,74 @@
+const resolve = require("path").resolve,
+    execSync = require("child_process").execSync,
+    { readdirSync, readFileSync } = require("fs")
+
+function run() {
+    // check fetch-depth
+    const commitCount = execSync("git rev-list --count HEAD", { encoding: "utf-8" })
+    if (commitCount < 2) {
+        failure("😤 commit history needs to be >= 2")
+        return
+    }
+
+    // find project
+    const repoDir = process.env.GITHUB_WORKSPACE,
+        projDir = resolve(repoDir, process.env.INPUT_PROJECT_DIR),
+        projFiles = readdirSync(projDir).filter(f => f.endsWith(".csproj"))
+
+    if (projFiles.length === 0) {
+        failure("😭 project not found")
+        return
+    }
+
+    // check for version changes
+    const projName = projFiles[0],
+        projPath = resolve(projDir, projName),
+        versionRegex = /<Version>(.*)<\/Version>/,
+        gitDiff = execSync(`git diff -U0 HEAD^ -- ${projPath}`, { encoding: "utf-8" }),
+        isVersionChanged = versionRegex.test(gitDiff)
+
+    if (!isVersionChanged) {
+        console.log(`🥱 no version change in ${projName}`)
+        return
+    }
+
+    console.log(`👍 found version change in ${projName}`)
+
+    // create tag
+    const projContents = readFileSync(projPath, { encoding: "utf-8" }),
+        newVersion = versionRegex.exec(projContents)[1],
+        tagFormat = process.env.INPUT_TAG_FORMAT,
+        tag = tagFormat.replace("*", newVersion),
+        istagPresent = execSync("git tag -l --contains", { encoding: "utf-8" }).indexOf(tag) >= 0
+
+    if (istagPresent) {
+        console.log(`😢 tag named ${newVersion} already exists`)
+        return
+    }
+
+    execSync(`git tag ${tag}`, { encoding: "utf-8" })
+    execSync(`git push origin ${tag}`, { encoding: "utf-8" })
+
+    // pack & push
+    const nugetKey = process.env.INPUT_NUGET_KEY
+
+    if (!nugetKey)
+        return
+
+    if (!execSync("command -v dotnet", { encoding: "utf-8" })) {
+        failure("😭 dotnet not found")
+        return
+    }
+
+    execSync(`dotnet pack -c Release ${projPath} -o .`, { encoding: "utf-8" })
+
+    if (nugetKey)
+        execSync(`dotnet nuget push *.nupkg -s https://api.nuget.org/v3/index.json -k ${nugetKey}`, { encoding: "utf-8" })
+}
+
+function failure(msg) {
+    process.exitCode = 1
+    console.log(msg)
+}
+
+run()
\ No newline at end of file