doc(contribute) add commit message conventions

CONTRIBUTING.md

@@ -1,16 +1,49 @@
-If you would like to contribute - send pull request to dev branch.
-Getting dev version of **Cloud Commander**:
-
-    git clone git://github.com/coderaiser/cloudcmd.git
-    git checkout dev
-
-or by [link](https://github.com/coderaiser/cloudcmd/tree/dev "Dev version").
-
-It is possible thet dev version Cloud Commander will needed dev version of Minify,
-so to get it you should type a couple more commands:
-
-    cd node_modules
-    rm -rf minify
-    git clone git://github.com/coderaiser/minify
-    cd  minify
+Brunch
+---------------
+If you would like to contribute - send pull request to dev branch.
+Getting dev version of **Cloud Commander**:
+
+    git clone git://github.com/coderaiser/cloudcmd.git
     git checkout dev
+
+or by [link](https://github.com/coderaiser/cloudcmd/tree/dev "Dev version").
+
+It is possible thet dev version Cloud Commander will needed dev version of Minify,
+so to get it you should type a couple more commands:
+
+    cd node_modules
+    rm -rf minify
+    git clone git://github.com/coderaiser/minify
+    cd  minify
+    git checkout dev
+
+Commit
+---------------
+Format of the commit message: **type(scope): subject**
+
+**Type**:
+- feature
+- fix (bug fix)
+- docs (documentation)
+- style (formatting, missing semi colons, …)
+- refactor
+- test (when adding missing tests)
+- chore (maintain)
+
+**Scope**:
+Scope could be anything specifying place of the commit change.
+For example util, console, view, edit, style etc...
+
+**Subject text**:
+- use imperative, present tense: “change” not “changed” nor “changes”
+- don't capitalize first letter
+- no dot (.) at the end
+**Message body**:
+- just as in <subject> use imperative, present tense: “change” not “changed” nor “changes”
+- includes motivation for the change and contrasts with previous behavior
+
+**Examples**:
+- [fix(style) .name{width}: 37% -> 35%](https://github.com/coderaiser/cloudcmd/commit/94b0642e3990c17b3a0ee3efeb75f343e1e7c050)
+- [fix(console) dispatch: focus -> mouseup](https://github.com/coderaiser/cloudcmd/commit/f41ec5058d1411e86a881f8e8077e0572e0409ec)
+
+**Big change should be writed in ChangeLog like [this](https://github.com/coderaiser/cloudcmd/commit/e1893f77be09585decf8a260d45a42efc11c98e5).**