feat: create issue templates

Bug report, feature request, and documentation templates

Author: heitorlessa

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug, triage
+assignees: ''
+
+---
+
+<!--- Provide a general summary of the issue in the Title above -->
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+
+**What were you trying to accomplish?**
+
+## Expected Behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+## Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change -->
+
+## Steps to Reproduce (for bugs)
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Environment
+
+* **Powertools version used**:
+* **Packaging format (Layers, PyPi)**:
+* **AWS Lambda function runtime:** 
+* **Debugging logs**
+
+> [How to enable debug mode](https://awslabs.github.io/aws-lambda-powertools-python/#debug-mode)**
+
+```python
+# paste logs here
+```

.github/ISSUE_TEMPLATE/documentation-improvements.md

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+---
+name: Documentation improvements
+about: Suggest a documentation update
+title: ''
+labels: documentation
+assignees: ''
+
+---
+
+**What were you initially searching for in the docs?**
+<!-- Please help us understand how you looked for information that was either not available or unclear -->
+
+**Is this related to an existing part of the documentation? Please share a link**
+
+**Describe how we could make it clearer**
+
+**If you have a proposed update, please share it here**

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: triage, feature-request
+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. -->