added github Issue and PR templates for contributions

.github/ISSUE_TEMPLATE.md

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+<!--
+
+Note: If you are using www.overleaf.com and have a problem, 
+      or if you would like to request a new feature please contact
+      the support team at support@overleaf.com
+      
+      This form should only be used to report bugs in the 
+      Community Edition release of Overleaf.
+
+-->
+
+
+
+<!-- BUG REPORT TEMPLATE -->
+
+## Steps to Reproduce
+<!-- Describe the steps leading up to when / where you found the bug. -->
+<!-- Screenshots may be helpful here. -->
+
+1.
+2.
+3.
+
+## Expected Behaviour
+<!-- What should have happened when you completed the steps above? -->
+
+## Observed Behaviour
+<!-- What actually happened when you completed the steps above? -->
+<!-- Screenshots may be helpful here. -->
+
+## Context
+<!-- How has this issue affected you? What were you trying to accomplish? -->
+
+## Technical Info
+<!-- Provide any technical details that may be applicable (or N/A if not applicable). -->
+
+* URL:
+* Browser Name and version:
+* Operating System and version (desktop or mobile):
+* Signed in as:
+* Project and/or file:
+
+## Analysis
+<!--- Optionally, document investigation of / suggest a fix for the bug, e.g. 'comes from this line / commit' -->

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+<!-- Goal of the pull request -->
+
+
+## Related issues / Pull Requests
+<!-- Fixes #xyz, Contributes to #xyz, Related to #xyz-->
+
+
+## Contributor Agreement
+
+- [ ] I confirm I have signed the [Contributor License Agreement](https://github.com/overleaf/overleaf/blob/master/CONTRIBUTING.md#contributor-license-agreement)