SM-673 Add basic PR templates

.github/PULL_REQUEST_TEMPLATE/bugfix_pr.md

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+---
+name: Bugfix PR
+about: Resolving issues in existing SID features
+
+---
+
+[JIRA ticket]()
+Will be released in: **version**
+First known affected version: **version**
+
+### Root cause analysis
+
+* Describe how it was found and what caused the issue
+* Include images to better illustrate the issue
+
+### Notable changes
+
+* Describe the changes in the PR and how they fix the root cause
+* Include images or video to better illustrate the fix
+
+### Testing guidance
+
+* Describe how the reviewers can verify that issue is fixed
+
+### Additional work checklist
+
+* [ ] Effect on other features and security has been considered
+* [ ] Test cases in Testiny are up to date (or ticket created)
+* [ ] Other teams notified about the fix (if applicable)

.github/PULL_REQUEST_TEMPLATE/feature_pr.md

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+---
+name: Feature PR
+about: Additions and improvements to SID
+
+---
+
+[JIRA ticket]()
+Will be released in: **version**
+
+### Notable changes
+
+* Describe the main changes in the PR with the reasons why they are required
+* Include images to better illustrate the changes
+
+### Testing guidance (optional)
+
+* Describe how the reviewers can try the new features out
+
+### Additional work checklist
+
+* [ ] Effect on other features and security has been considered
+* [ ] Design document marked as "In development" (if applicable)
+* [ ] External (Gitbook) and internal (Confluence) Documentation is up to date (or ticket created)
+* [ ] Test cases in Testiny are up to date (or ticket created)
+* [ ] Other teams notified about the changes (if applicable)