Update README

Author: microcoder

README.md

@@ -1,13 +1,39 @@
 # ConfigRW
-**ConfigRW** is a simple reader and writer config files based on key-value or INI-structure.
 
-    * Максимально сохраняет форматирование исходного файла (отступы, пробелы, комментарии, etc)
+ConfigRW is a simple python module which read and write config files based on key-value or INI-structure.
 
-# Documentation
+## Key features
+
+* Maximum preserves formatting of the source file (indents, spaces, comments, etc)
+* Support non-section (for access for simple config files based on key-value)
+* Inserting an option on an arbitrary string in the section
+* Support multiple values of option
+* Support options without values
+* Support comments in a section
+* Support indentation for options, values
+* Secure file rewriting. Using *.new file on write, then renamed to original filename
+
+## Installation
+
+Installation package to user python-library directory:
+
+```bash
+$ pip install --user configrw
+```
+
+Or you can install package to global system directory of python libraries (not recommended):
+
+```bash
+$ sudo pip install configrw
+```
+
+## Documentation
 
 You can find a full manual on how to use ConfigRW at [readthedocs](https://configrw.readthedocs.io)
 
-# Quick start
+## Quick start
+
+In next examples we will use the following INI file:
 
 ```ini
 # This is comment
@@ -34,7 +60,7 @@ second option  = -100
         ext3
 ```
 
-## Access to non-section area
+### Access to non-section area
 
 This is features needed if you want use simple key-value of config file
 
@@ -49,7 +75,7 @@ section['this is option'] = None   # Setting the value
 del section['second option']       # Deleting the option
 ```
 
-## Access to section area
+### Access to section area
 
 This is features needed if you want use INI config file