PR and issue templates created

Author: preethamvishy

.github/ISSUE_TEMPLATE.md

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+- [ ] I have checked that this issue is not a duplicate of an existing issue
+
+
+
+## Issue Type
+What kind of issue is this?
+
+<!-- Please check using "x" -->
+
+- [ ] Bug report
+- [ ] Feature request
+- [ ] Code style issue
+- [ ] Documentation issue
+- [ ] Other - Please describe:
+
+
+## What is the current behavior?
+
+
+## What is the expected behavior?
+
+
+## Other information
+

.github/PULL_REQUEST_TEMPLATE.md

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+## PR Checklist
+Please check all that apply to this PR using "x":
+
+- [ ] I have read the [contributing guide](https://github.com/src-d/ml/blob/master/contributing.md)
+- [ ] I have checked that this PR is not a duplicate of an existing PR (open, closed or merged)
+- [ ] I have checked that this PR does not introduce a breaking change
+- [ ] This PR introduces breaking changes and I have provided a detailed explanation below
+
+
+## PR Type
+What kind of change does this PR introduce?
+
+<!-- Please check all that apply to this PR using "x". -->
+
+- [ ] Bugfix
+- [ ] Feature
+- [ ] Breaking changes (bugfix or feature that introduces breaking changes)
+- [ ] Code style update (formatting)
+- [ ] Refactoring (no functional changes)
+- [ ] Documentation changes
+- [ ] Other - Please describe:
+
+## Fixes
+
+Issue Number: N/A
+
+
+## What is the current behavior?
+
+
+## What is the new behavior?
+
+
+## Other information
+
+
+<!-- If this PR contains a breaking change, please describe the impact and solution strategy for existing applications below. -->