readme for compiler scripts

bin/compiler/README.md

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+## How to compile:
+
+first of all, if you need some custom configuration you have to copy and rename
+config.sh.dist in config.sh and configure it
+
+* for a "clean" compilation you must run all scripts in their order:
+
+        ./1-clean.sh
+        ./2-configure.sh
+        ./3-build.sh
+
+* if you add/rename/delete some sources and you need to compile it you have to run:
+
+        ./2-configure.sh
+        ./3-build.sh
+
+* if you have modified code only, you just need to run
+
+        ./3-build.sh
+
+
+## Note:
+
+For an optimal development process and **really faster** compilation time, is suggested to use clang instead of gcc