Update the github helpers (#129)

add CONTRIBUTING.md
updated README.md

* changed source folder name to 'src'

* upd *Spec.js

* - upd spec/QB-ContentSpec.js
 - upd CONTRIBUTING.md

* add ISSUE_TEMPLATE.md

* upd ISSUE_TEMPLATE.md (set a link in existing issues)

* add PULL_REQUEST_TEMPLATE.md

* upd PULL_REQUEST_TEMPLATE.md

* - ask in another way

* upd text in ISSUE_TEMPLATE.md

Author: dimaspirit

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,23 @@
+*Help avoid duplicate issue reports, check [existing issues](https://github.com/QuickBlox/quickblox-javascript-sdk/issues)*
+
+**Environment details**
+*(Operating system, browser information)*
+
+
+**Did this work before?**
+
+
+**Expected behavior**
+
+
+**Actual behavior**
+
+
+**Logs**
+*(please, switch on a [debugging mode](http://quickblox.com/developers/Javascript#Configuration) and share us outputs)*
+
+
+**Steps to reproduce the behavior**
+
+
+**Any others comments?**

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,13 @@
+*Make sure that you wrote the tests for your proposed changes and the existing test was success.*
+
+**What are the relevant tickets?**
+
+
+**Proposed changes:**
+-
+-
+
+**How should this be manually tested?**
+
+
+**Do we need to update documentation?**