Adding contributing guidelines to templates.

Author: krmahadevan

.github/ISSUE_TEMPLATE.md

@@ -20,3 +20,8 @@
 
 ### Test case sample
 > Please, share the test case (as small as possible) which shows the issue
+
+
+### Contribution guidelines
+
+Incase you plan to raise a pull request to fix this issue, please make sure you refer our [Contributing](.github/CONTRIBUTING.md) section for detailed set of steps.

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,6 +4,7 @@ Fixes # .
 
 - [ ] Add test case(s)
 - [ ] Update `CHANGES.txt`
+- [ ] Auto applied styling via `./gradlew autostyleApply`
 
 We encourage pull requests that:
 
@@ -12,3 +13,5 @@ We encourage pull requests that:
 
 If your pull request involves fixing SonarQube issues then we would suggest that you please discuss this with the 
 [TestNG-dev](https://groups.google.com/forum/#!forum/testng-dev) before you spend time working on it.
+
+**Note:** For more information on contribution guidelines please make sure you refer our [Contributing](.github/CONTRIBUTING.md) section for detailed set of steps.