Create README.md

README.md

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+evchain
+=======
+
+Installation
+------------
+
+
+For installation, some knowledge about haskell toolchain
+(`cabal-install` for example) is quite needed although it is not crazily
+difficult once getting used to it. For you to just start, you need to
+have `ghc-7.4` or higher and `cabal-install` installed on your system, and
+clone the following packages from http://github.com/hep-platform :
+
+`HEPUtil`
+`conduit-util`
+`LHEParser`
+`LHE-sanitizer`
+`madgraph-auto`
+`madgraph-auto-model`
+`pipeline-eventgen`
+`evchain`
+
+and at each directory, you need to run `cabal install`
+After evchain is installed, you need to write a script in haskell for
+using evchain.
+One actual example of such script is
+ https://github.com/wavewave/lhc-analysis-collection/blob/master/exe/2013-07-20-XUDD.hs