doc: add readme

Signed-off-by: Tony Gorez <[email protected]>

Brewfile

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 brew "cmake"
-brew "clang-format"
-brew "doxygen"
-brew "v8"

README.markdown

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+<h1 align="center">small</h1>
+<h3 align="center">Toy runtime build on top of <a src="https://github.com/crossnx/includejs">includejs</a></h3>
+<p align="center">
+  <a href="https://github.com/crossnx/small/actions/workflows/ci.yml"><img src="https://github.com/crossnx/small/actions/workflows/ci.yml/badge.svg" alt="github action build"></a>
+</p>
+
+## Usage
+
+```
+./build/small_runtime <path of your .fs file>
+```
+
+Example:
+
+```
+./build/small_runtime index.js
+```
+
+## Dependencies
+
+- C++
+- CMake
+- JavascriptCore
+- Brew (macOS)
+
+## Build localy
+
+### Install dependencies
+
+- For `macOS`
+  ```
+  brew bundle 
+  ```
+
+- For Ubuntu
+  ```
+  sudo apt-get install --yes libjavascriptcoregtk-4.0-dev
+  ```
+
+### Run
+
+```
+make
+```
+
+When the build is finished, you'll find the executable available:
+
+```
+./build/small_runtime
+```