feat: added github issue and pull request templates

.github/ISSUE_TEMPLATE.md

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+#### What are you trying to achieve?
+
+#### What do you get instead?
+
+### Details
+
+* Librarian version:
+* Operating System:

.github/PULL_REQUEST_TEMPLATE.md

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+## Motivation/Description of the PR
+- Description of this PR, which problem it solves
+- Resolves #issueId (if applicable).
+
+## Type of change
+
+- [ ] :fire: Breaking changes
+- [ ] :rocket: New functionality
+- [ ] :bug: Bug fix
+- [ ] :clipboard: Documentation changes/updates
+- [ ] :hotsprings: Hot fix
+- [ ] :hammer: Markdown files fix - not related to source code
+- [ ] :nail_care: Polish code
+
+## Checklist:
+
+- [ ] Tests have been added
+- [ ] Documentation has been added
+- [ ] Lint checking
+- [ ] Local tests are passed (Run `yarn test`)