add README.md

README.md

+# Jenkins-Scripts #
+
+The *WHIZARD* team uses as continuous integration system Jenkins.
+The scripts for configuring compilers and building processes are managed by this repository.
+
+## Version Numbering ##
+
+Version numbering is quite non trivial.
+Let's see for the gcc compiler, we have:
+ `gcc-5.0-234663
+ gcc-5.0-LATEST -> gcc-5.0-234663
+ gcc-5.1.0
+ gcc-5.1-225979
+ gcc-5.1-LATEST -> gcc-5.1-225979
+ gcc-5.2.0
+ gcc-5.2-229639
+ gcc-5.2-231093
+ gcc-5.2-LATEST
+ `
+The numbers with *LATEST* are linked to last revision from the latest version of the gcc developer trunk.
+The compiler from the gcc svn trunk are always tagged with their respective revision number.
+If the compiler is numbered as e.g. gcc-5.2(.0), it is a stable version of the compiler.