docs: setup guide (#39)

README.md

@@ -1,3 +1,39 @@
 # mdsf
 
 Format markdown code snippets using your favorite code formatters.
+
+## Installation
+
+The latest version of `mdsf` can be downloaded directly from [github.com/hougesen/mdsf/releases](https://github.com/hougesen/mdsf/releases).
+
+### Cargo
+
+Install using the [published crate](https://crates.io/crates/mdsf):
+
+```sh
+cargo install mdsf
+```
+
+or directly from source:
+
+```sh
+git clone [email protected]:hougesen/mdsf.git
+
+cargo install --path ./mdsf --bin mdsf
+```
+
+## Usage
+
+```sh
+mdsf format NAME_OF_FOLDER_OR_FOLDER
+```
+
+## Configuration
+
+The default configuration of `mdsf` aims to as sane as possible. For that reason the default formatter for each language is the one most people have installed.
+
+If you are interested in customizing which formatter is run, you can create a new `mdsf` configuration file by running
+
+```sh
+mdsf init
+```