Add docs about available functions.

Author: grafov

README.md

@@ -1,8 +1,50 @@
+<!--*- mode:markdown;mode:orgtbl;fill-column:99 -*-->
 # rust-playground [WIP]
 
 GNU/Emacs mode that setup local playground for code snippets in Rust
-language.  This is a fast and dirty port of
+language.  This is a port of
 [go-playground](https://github.com/grafov/go-playground) adapted for
 Rust environment.
 
-*Work in progress.*
+## Install
+
+Install `rust-playground` from MELPA:
+
+    M-x package-install RET rust-playground
+
+The mirror repository of the project: https://notabug.org/grafov/rust-playground.
+I really not think that this small project need the mirror but I just would like advertise a nice
+git hosting for FOSS. Try [notabug.org](https://notabug.org) for your projects! :)
+
+## Usage
+
+### Quick start
+
+1. From any mode run `M-x rust-playground` for start a new playground buffer filled with basic
+   template for the package with main function (see the picture below).
+1. Add your code then press `Ctl-Return` (it bound to `rust-playground-exec` command). It will save,
+   compile and exec the snippet code.
+1. When you played enough with this snippet just run `M-x rust-playground-rm`. It will remove the
+   current snippet with its directory and all files.
+
+### List of interactive functions
+
+<!---
+#+ORGTBL: SEND keys orgtbl-to-gfm
+| Function name              | Description                                                          |
+|----------------------------+----------------------------------------------------------------------|
+| `rust-playground`          | Create a new playground buffer with basic template for the package.  |
+| `rust-playground-download` | [WIP] Download the snippet from the URL at play.rust-lang.org.       |
+| `rust-playground-exec`     | Save, compile and run the code of the snippet.                       |
+| `rust-playground-upload`   | [WIP] Upload the buffer to play.golang.org and return the short URL. |
+| `rust-playground-rm`       | Remove the snippet with its directory with all files.                |
+-->
+<!--- BEGIN RECEIVE ORGTBL keys -->
+| Function name | Description |
+|---|---|
+| `rust-playground` | Create a new playground buffer with basic template for the package. |
+| `rust-playground-download` | [WIP] Download the snippet from the URL at play.rust-lang.org. |
+| `rust-playground-exec` | Save, compile and run the code of the snippet. |
+| `rust-playground-upload` | [WIP] Upload the buffer to play.golang.org and return the short URL. |
+| `rust-playground-rm` | Remove the snippet with its directory with all files. |
+<!--- END RECEIVE ORGTBL keys -->