Update README

Author: moogle19

README.md

@@ -1,21 +1,44 @@
 # Excoding
 
-**TODO: Add description**
+String encoding/decoding NIF using rust [encoding](https://crates.io/crates/encoding) library.
 
 ## Installation
 
-If [available in Hex](https://hex.pm/docs/publish), the package can be installed
-by adding `excoding` to your list of dependencies in `mix.exs`:
+The package can be installed by adding `excoding` to your list of dependencies in `mix.exs`:
 
 ```elixir
 def deps do
   [
-    {:excoding, "~> 0.1.0"}
+    {:excoding, "~> 1.0"}
   ]
 end
 ```
 
-Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
-and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
-be found at <https://hexdocs.pm/excoding>.
+It requires rustc and cargo to compile. Easiest way to install required tools is 
+to use excellent [rustup](https://rustup.rs/) script.
+
+## License
+
+The MIT License (MIT)
+
+Copyright (c) 2020, Milan Jaric.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+