added c++ coding style

coding-style.md

@@ -0,0 +1,43 @@
+## C++ Coding Style
+
+Mainly borrowed from [google c++ style coding style](http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml)
+
+### Naming Conventions
+
+#### Member Vairables
+
+Lower case words seprated by underscores, and ends with an underscore, e.g. `repos_list_`, `context_menu_`
+
+#### Variables in Qt Ui Files
+
+Camel case starts with a "m", e.g. `mUserNameText`, `mServerAddr`
+
+#### Functions
+
+Camel case, e.g. `showRepos`
+
+#### Setter and Getter
+
+- setter: `setRepoName()`
+- getter: `repoName()`
+
+#### Constants
+
+Camel case starts with "k", e.g. :
+
+    const int kRepoRefreshInterval = 1000;
+    const char *kDefaultName = "seafile";
+
+Use constants variables instead of macros to define constants.
+
+### Invoking functions
+
+- constant function parameter must be passed by object reference
+- No `this->` when invoking member functions.
+
+### Others
+
+- no source file scope static variable/function, use anonymous namespace
+- use forward declaration when possible, instead of including unnecessary header files
+- Never use exceptions
+

dev-guide.md

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 ## C++ Coding Style
 
-TO DO
+Refer to `coding-style.md`
 
 ## I18N