Templates for pull requests and issues (#86)

* Add issue template for better explanation of issues

* Add template for pull request to standardize the information taken

.github/ISSUE_TEMPLATE.md

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+## What did you do? 
+Please include the actual source code causing the issue.
+
+## What did you expect to happen?
+Please mention the expected behaviour.
+
+## What happened actually?
+
+### Which versions of react-content-loader, and which browser are affected by this issue?
+Please also mention the version of react.

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+In this section, you should give the overview of the problem and the proposed changes.
+
+## Related Issue #[issue number]
+If this PR is fixing any issue, then please include - Related Issue #[issue number]
+
+## Any Breaking Changes
+If this PR is introducing any breaking changes then mention them in this section.
+
+## Checklist
+- [] Are all the test cases passing?
+- [] If any new feature has been added, then are the test cases updated/added?
+- [] Has the documentation been updated for the proposed change, if required?