Add README

Author: x1unix

.gitignore

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+.DS_Store
 .idea/
 .vscode/
 node_modules
 /public/
-/target/
+/target/

README.md

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+<p style="text-align: center;">
+# Better Go Playground
+
+Improved Go Playground powered by Monaco Editor and React
+
+![alt text](./docs/demo.gif)
+</p>
+
+## Features
+
+* 💡 Code autocomplete
+* 💾 Load and save files
+* 🌚 Dark theme
+
+And more
+
+## Demo
+
+[http://goplay.x1unix.com/](http://goplay.x1unix.com/)
+
+## Installation
+
+Playground is available via [Docker Hub](https://hub.docker.com/r/x1unix/go-playground) or can be built and run locally (**Go 1.12+** and **Node.js** required):
+
+```
+$ git clone https://github.com/x1unix/go-playground.git
+$ cd go-playground
+$ make
+```
+
+Output package will be at `target` directory.
+
+
+