Add a readme for coders. (should go when makefile)

README_CODER.txt

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+
+*** Scripts:
+
+** clean_heptc
+* Arguments: none.
+* Usages: used to remove heptc binaries and compiled files. It's main goal is to do a fresh compilation. heptc script may be called right after this to recompile all the things needed.
+
+** heptc
+* Arguments: see heptc -h
+* Usages: wrap the real compiler in order to recompile it if it doesn't exists, and to recompile pervasives if needed. calling clean_heptc before it will ensure recompilation of everything.
+
+*** Code organization:
+

config

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+srcdir      = .
+top_srcdir  = .
+prefix      = /opt/local
+exec_prefix = ${prefix}
+bindir      = ${exec_prefix}/bin
+libdir      = ${exec_prefix}/lib
+
+INSTALL= /usr/bin/install -c
+MAKE= @MAKE@
+
+BUILD= _build
+COMPILER=heptc
+SIMULATOR=hepts
+
+INSTALL_BINDIR=$(bindir)
+INSTALL_LIBDIR=$(libdir)/heptagon
+STDLIB_DIR=${exec_prefix}/lib/heptagon
+
+OCAMLBUILD=STDLIB=$(STDLIB_DIR) ocamlbuild
+
+TARGET=byte
+ENABLE_SIMULATOR=yes