update readme

Author: chobie

README.md

@@ -27,40 +27,62 @@ GIT_EXTERN(int) git_repository_init(
         unsigned is_bare);
 
 
-// error code will handle extension.
+// error code should handle in extension.
 // resource creation or getting functions will return their resource or bool.
 resource|bool function git_repository_init(string $path, long $is_bare);
 
-some small structure (e.g: git_config_entry) should consider return as an array. it's usefull.
+public struct (e.g: git_config_entry) should consider return as an array.
 ````
 
-see http://libgit2.github.com/libgit2/#HEAD
+see libgit2.github.com/libgit2/#v0.20.0
 
 ##### file name rules.
 
 basically, we rely libgit2 grouping at this time. (`branch` group functions should be in branch.c)
-some group (e.g config) will conflicts php headers. we choose `g_` prefix for now.
+some group (e.g config) will conflicts php header files. we choose `g_` prefix for now.
 
-check grouping here http://libgit2.github.com/libgit2/#HEAD
+check grouping here libgit2.github.com/libgit2/#v0.20.0
 
 ##### generating files
 
 if you wanna try to work new file. please use gen.php and generate stubs. as declarations are bored task.
 (sometimes, this generator might output wrong headers. then just comment out or fix generator)
 
 ````
-php gen.php libgit2/include/git2/branch.h (0|1) [filter] > target.c or target.h
+php gen.php libgit2/include/git2/branch.h 0  > branch.h
+
+# improved code generator
+php ng.php libgit2/include/git2/branch.h > branch.c
 ````
 
-you can ouptut function entry with this. past it to `php_git2.c`
+you can generate `PHP_FE` with this. past it to `php_git2.c`
 
 ````
 php fe.php target.c
 ````
 
+Note: usually, these generators might output needless variables. DON'T PR `prettify codes` at this moment.
+As we have more than 500 php functions. we like to use some fixer command than fix by hand.
+
+##### documents
+
+use prototype.
+
+```
+  /* {{{ proto int abs(int number)
+     Returns the absolute value of the number */
+  PHP_FUNCTION(abs)
+  {
+     ...
+  }
+  /* }}} */
+```
+
+document will generate later. please check source code before publish docs.
+
 ##### testing
 
-group/function.phpt
+[group]/[function].phpt
 
 ##### policy