minor updates to readme

* grammar fixes
* note working VS2013 version
* change tabs to spaces to ensure proper viewing on systems with
* different tab settings

README.md

@@ -1,21 +1,26 @@
 i2pd
 ====
 
-i2p router for Linux written on C++
+I2P router written in C++
 
-Requires gcc 4.6 and higher, boost 1.46 and higher, crypto++
+Requirements for Linux/FreeBSD/OSX
+----------------------------------
 
-on Windows
+GCC 4.6 or newer, Boost 1.46 or newer, crypto++. Clang can be used instead of
+GCC.
 
-Requires msvs2013 (require Visual C++ Compiler November 2013 CTP update), boost 1.46 and higher, crypto++
+Requirements for Windows
+------------------------
+
+VS2013 (known to work with 12.0.21005.1), Boost 1.46 or newer, crypto++.
 
 Build Statuses
 ---------------
 
 - Linux x64      - [![Build Status](https://jenkins.nordcloud.no/buildStatus/icon?job=i2pd-linux)](https://jenkins.nordcloud.no/job/i2pd-linux/)
-- Linux ARM      - Too be added
+- Linux ARM      - To be added
-- Mac OS X       - Too be added
+- Mac OS X       - To be added
-- Microsoft VC13 - Too be added
+- Microsoft VC13 - To be added
 
 
 Testing