docs: Add contributing guide and Issues/PR templates

.github/ISSUE_TEMPLATE.md

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+<!-- Please replace {Please write here} with your description -->
+
+
+## Expected Behavior
+
+{Please write here}
+
+
+## Actual Behavior
+
+{Please write here}
+
+
+## Steps to Reproduce (including precondition)
+
+{Please write here}
+
+
+## Screenshot on This Problem (if possible)
+
+{Please write here}
+
+
+## Your Environment
+
+- OS: {Please write here}
+- git-chglog version: {Please write here}
+

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Thank you for your contribution to git-chglog! Please replace {Please write here} with your description -->
+
+
+## What does this do / why do we need it?
+
+{Please write here}
+
+
+## How this PR fixes the problem?
+
+{Please write here}
+
+
+## What should your reviewer look out for in this PR?
+
+{Please write here}
+
+
+## Check lists
+
+* [ ] Test passed
+* [ ] Coding style (indentation, etc)
+
+
+## Additional Comments (if any)
+
+{Please write here}
+
+
+## Which issue(s) does this PR fix?
+
+<!--
+fixes #
+fixes #
+-->