add ChangeLog file, and rename some documentation files
diff --git a/HACK.TXT b/HACK.TXT
new file mode 100644
index 0000000..2462169
--- /dev/null
+++ b/HACK.TXT
@@ -0,0 +1,29 @@
+Capstone source is organized as followings.
+
+
+. <- core engine + README + COMPILE.TXT etc
+├── arch <- code handling disasm engine for each arch
+│ ├── AArch64 <- ARM64 (aka ARMv8) engine
+│ ├── ARM <- ARM engine
+│ ├── Mips <- Mips engine
+│ ├── PowerPC <- PowerPC engine
+│ └── X86 <- X86 engine
+├── bindings <- all bindings are under this dir
+│ ├── java <- Java bindings + test code
+│ ├── ocaml <- Ocaml bindings + test code
+│ ├── python <- Python bindings + test code
+├── include <- API headers in C language (*.h)
+├── suite <- Development test tools - for Capstone developers only
+├── tests <- Test code (in C language)
+
+
+Follow instructions in COMPILE.TXT to see how to compile and run code.
+
+Note: if you find some strange bugs, it is recommended to firstly clean
+the code and try to recompile/reinstall again. This can be done with:
+
+ $ make clean
+ $ make
+ $ sudo make install
+
+