Docs: Add a small info about how to report compilation errors, AND inform how to properly "hunt" for the error.

--HG--
branch : trunk

doc/COMPILATION_HELP.TXT

@@ -0,0 +1,31 @@
+NOTE TO USERS WITH COMPILE-ERRORS :
+
+Before commenting on our issuetracker that "it doesn't compile", we ask you
+to do the following :
+
+* Clear the CMake cache
+
+  In certain cases we adjust and modify the buildsystem (adding/removing 
+  functions/functionality.
+
+* Remove/delete and recreate your build directory, and recompile
+
+  In most cases any linking-errors are related to that the build-
+  system has not caught up with specific changes.
+
+* Compile on a CLEAN sourcetree
+
+  We can not, for obvious reasons, support cores that has been modified.
+  As you might understand, we're not psychics: we're not aware of what 
+  you have done to your sourcetree, and as such : We can't see what your 
+  additional code is like.
+
+* SUPPLY PROPER LOGS ON COMPILE-ERRORS
+
+  This means: Add as MUCH info as possible to the issue, including the 
+  full log from the compile itself (or at least include the 20 lines 
+  above AND under the compile-error itself).
+
+Happy compiling, and have a nice day!
+
+-- The TrinityCore developers