github: add pull request and issue template

.github/ISSUE_TEMPLATE.md

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+### Description
+
+[Description of the bug or feature]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+### Expected behavior:
+
+[What you expected to happen]
+
+### Actual behavior
+
+[What actually happened]
+
+### Versions
+
+You can get this information from executing `caso --version`.

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please include a summary of the change and which issue is fixed. Please also
+include relevant motivation and context. List any dependencies that are
+required for this change. Please note that there may be some sections that may
+not apply to your change, in that case feel free to delete them.
+
+Fixes # (issue)
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+- [ ] This change is a documentation update
+
+# How Has This Been Tested?
+
+Please describe the tests that you ran to verify your changes. Provide
+instructions so we can reproduce. Please also list any relevant details for
+your test configuration
+
+- [ ] Test A
+- [ ] Test B
+
+# Checklist:
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes