Add github templates (#1)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. 
+Not doing so may result in your bug not being addressed in a timely manner. Thanks! -->
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- Tamarco version (e.g. `pip freeze | grep tamarco`):
+- OS (e.g: `cat /etc/os-release`):
+- Others:
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Please only use this template for submitting enhancement or new feature requests -->
+
+**What would you like to be added**:
+
+**Why is this needed**:
+

.github/PULL_REQUEST_TEMPLATE.md

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+Please reference any issue related to this pull request. Example: `Fixes #1`.
+
+See [here](https://blog.github.com/2015-01-21-how-to-write-the-perfect-pull-request/) for tips on good 
+pull request description.
+