Add issue and PR templates (#228)

Signed-off-by: Annanay <annanayagarwal@gmail.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+<!-- A clear and concise description of what the bug is.-->
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Start Tempo (SHA or version)
+2. Perform Operations (Read/Write/Others)
+
+**Expected behavior**
+<!-- A clear and concise description of what you expected to happen. -->
+
+**Environment:**
+ - Infrastructure: [e.g., Kubernetes, bare-metal, laptop]
+ - Deployment tool: [e.g., helm, jsonnet]
+
+**Additional Context**
+<!--  Additional relevant info which can help us debug this issue easily like Logs, Configuration etc. -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+**Describe the solution you'd like**
+<!-- A clear and concise description of what you want to happen. -->
+
+**Describe alternatives you've considered**
+<!-- A clear and concise description of any alternative solutions or features you've considered. -->
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here. -->

.github/pull_request_template.md

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+<!--  Thanks for sending a pull request!  Before submitting:
+
+1. Read our CONTRIBUTING.md guide
+2. Rebase your PR if it gets out of sync with master
+-->
+
+**What this PR does**:
+
+**Which issue(s) this PR fixes**:
+Fixes #<issue number>
+
+**Checklist**
+- [ ] Tests updated
+- [ ] Documentation added
+- [ ] `CHANGELOG.md` updated - the order of entries should be `[CHANGE]`, `[FEATURE]`, `[ENHANCEMENT]`, `[BUGFIX]`