chore: add changesets and CI

.changeset/README.md

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+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

.changeset/config.json

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+{
+  "$schema": "https://unpkg.com/@changesets/[email protected]/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "restricted",
+  "baseBranch": "master",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    branches:
+      - main
+      - master
+
+jobs:
+  release:
+    # Prevents changesets action from creating a PR on forks
+    if: github.repository == 'justinfagnani/html-include-element'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci --prefer-offline
+      - run: npm test
+
+      - name: Create Release PR or Publish
+        id: changesets
+        uses: changesets/action@v1
+        with:
+          publish: npx changeset publish
+          commit: "chore: prepare new version"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+

.github/workflows/test.yml

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+name: Test
+
+on:
+  pull_request:
+    branches:
+      - master
+      - main
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Configure node version
+        uses: actions/setup-node@v2
+        with:
+          node-version: 16
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci --prefer-offline
+
+      - run: npm test
+