documentation update (README.md)

Author: slavo2

README.md

@@ -2,20 +2,27 @@
 
 [![Build Status](https://travis-ci.org/hellogustav/elixir_email_reply_parser.svg?branch=master)](https://travis-ci.org/hellogustav/elixir_email_reply_parser)
 
-An Elixir port of https://github.com/github/email_reply_parser
+Originally an Elixir port of https://github.com/github/email_reply_parser
 as well as (especially) its port  of https://github.com/zapier/email-reply-parser
 
+For retrieval of the last reply from email message text (body).
+
 ## Installation
 
-If [available in Hex](https://hex.pm/docs/publish), the package can be installed
-by adding `elixir_email_reply_parser` to your list of dependencies in `mix.exs`:
+The package can be installed by adding `elixir_email_reply_parser` to your list of dependencies in `mix.exs`:
 
 ```elixir
 def deps do
   [{:elixir_email_reply_parser, "~> 0.1.0"}]
 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/elixir_email_reply_parser](https://hexdocs.pm/elixir_email_reply_parser).
+Published version of the docs can be found at [https://hexdocs.pm/elixir_email_reply_parser](https://hexdocs.pm/elixir_email_reply_parser).
+
+## Usage
+
+```elixir
+    iex> email_content = "Hi!\n\n How are you?\n__________\nFrom: Some Author\n\n Previous email"
+    iex> ElixirEmailReplyParser.parse_reply(email_content)
+    "Hi!\n\n How are you?"
+```