added readme.md for github

readme.md

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+# Cppcheck #
+
+## Donations ##
+
+### Donations ###
+
+If you find Cppcheck useful for you, feel free to make a donation.
+
+[![Donate](http://pledgie.com/campaigns/4127.png)](http://pledgie.com/campaigns/4127)
+
+## About the name ##
+
+The original name of this program is "C++check" but it was later changed to "cppcheck".
+
+Despite the name, Cppcheck is designed for both C and C++.
+
+## Manual ##
+
+A manual is available online:
+http://cppcheck.sf.net/manual.pdf
+
+## Compiling ##
+
+Any C++ compiler should work.
+
+To build the GUI, you need Qt.
+
+When building the command line tool, PCRE is normally used.
+PCRE is optional.
+
+There are multiple compilation choices:
+* qmake - cross platform build tool
+* Windows: Visual Studio
+* Windows: Qt Creator + mingw
+* gnu make
+* g++
+
+### qmake ###
+
+You can use the gui/gui.pro file to build the GUI.
+    cd gui
+    qmake
+    make
+
+### Visual Studio ###
+
+Use the cppcheck.sln file. The rules are normally enabled.
+
+To compile with rules (pcre dependency):
+* the pcre dll is needed. it can be downloaded from: http://cppcheck.sf.net/pcre-8.10-vs.zip
+
+To compile without rules (no dependencies):
+* remove the preprocessor define HAVE_RULES from the project
+* remove the pcre.lib from the project
+
+### Qt Creator + mingw ###
+
+The PCRE dll is needed to build the CLI. It can be downloaded here:
+http://software-download.name/pcre-library-windows/
+
+### gnu make ###
+
+To build Cppcheck with rules (pcre dependency):
+    make HAVE_RULES=yes
+
+To build Cppcheck without rules (no dependencies):
+    make
+
+### g++ (for experts) ###
+
+If you just want to build Cppcheck without dependencies then you can use this command:
+    g++ -o cppcheck -Ilib cli/*.cpp lib/*.cpp
+
+If you want to use --rule and --rule-file then dependencies are needed:
+    g++ -o cppcheck -lpcre -DHAVE_RULES -Ilib -Iexternals cli/*.cpp lib/*.cpp externals/tinyxml/*.cpp
+
+### mingw ###
+
+    make LDFLAGS=-lshlwapi
+
+### Cross compiling Win32 (CLI) version of Cppcheck in Linux ###
+
+    sudo apt-get install mingw32
+    make CXX=i586-mingw32msvc-g++ LDFLAGS="-lshlwapi"
+    mv cppcheck cppcheck.exe
+
+## Webpage ##
+
+    http://cppcheck.sourceforge.net/
+