Added some docs

.github/ISSUE_TEMPLATE.md

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+#### Summary
+Bug report in one concise sentence
+
+#### Steps to reproduce
+How can we reproduce the issue (what version are you using?)
+
+#### Expected behavior
+Describe your issue in detail
+
+#### Observed behavior (that appears unintentional)
+What did you see happen? Please include relevant error messages.
+
+#### Possible fixes
+If you can, link to the line of code that might be responsible for the problem

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Thank you for contributing a pull request! Here are a few tips to help you:
+
+1. If applicable, please check if unit tests are added for new features
+2. Read the contribution guide lines https://github.com/pikami/cosmium/docs/CONTRIBUTING.md
+
+-->
+
+#### Summary
+<!--
+A description of what this pull request does, as well as QA test steps (if applicable).
+-->
+
+#### Ticket Link
+<!--
+If applicable, please include a link to the GitHub issue:
+
+Fixes https://github.com/pikami/cosmium/issues/XXX
+-->