add PR and issue template

Author: joeyzhao2018

.github/ISSUE_TEMPLATE/bug_report_template.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+<!--- This repo is mainly used for packaging and releasing the Datadog AWS Lambda layers for [dd-trace-dotnet](https://github.com/DataDog/dd-trace-dotnet). Therefore, the issues and feature requests here would focus on the usage of the AWS Lambda layers. For other tracing issues or feature requests, please use [dd-trace-dotnet](https://github.com/DataDog/dd-trace-dotnet).--->
+---
+
+
+## Expected Behavior
+
+
+## Actual Behavior
+
+
+## Steps to Reproduce the Problem
+
+  1.
+  1.
+  1.
+
+## Specifications
+
+  - Datadog Lambda Layer version:
+
+## Stacktrace
+
+  ```
+  Paste here
+  ```

.github/ISSUE_TEMPLATE/feature_request_template.md

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+---
+name: Feature Request
+about: Suggest an idea
+<!--- This repo is mainly used for packaging and releasing the Datadog AWS Lambda layers for [dd-trace-dotnet](https://github.com/DataDog/dd-trace-dotnet). Therefore, the issues and feature requests here would focus on the usage of the AWS Lambda layers. For other tracing issues or feature requests, please use [dd-trace-dotnet](https://github.com/DataDog/dd-trace-dotnet).--->
+---
+
+## Expected Behavior
+
+
+## Actual Behavior
+
+
+## Steps to Reproduce the Problem
+
+  1.
+  1.
+  1.
+
+## Specifications
+
+  - Datadog Lambda Layer version:
+
+## Stacktrace
+
+  ```
+  Paste here
+  ```

.github/pull_request_template.md

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+<!--- Please remember to review the [contribution guidelines](https://github.com/DataDog/datadog-lambda-python/blob/main/CONTRIBUTING.md) if you have not yet done so._  --->
+
+### What does this PR do?
+
+<!--- A brief description of the change being made with this pull request. --->
+
+### Motivation
+
+<!--- What inspired you to submit this pull request? --->
+
+### Testing Guidelines
+
+<!--- How did you test this pull request? --->
+
+### Additional Notes
+
+<!--- Anything else we should know when reviewing? --->
+
+### Types of Changes
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Misc (docs, refactoring, dependency upgrade, etc.)
+
+### Check all that apply
+
+- [ ] This PR's description is comprehensive
+- [ ] This PR contains breaking changes that are documented in the description
+- [ ] This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
+- [ ] This PR impacts documentation, and it has been updated (or a ticket has been logged)
+- [ ] This PR's changes are covered by the automated tests
+- [ ] This PR collects user input/sensitive content into Datadog
+- [ ] This PR passes the integration tests (ask a Datadog member to run the tests)

CONTRIBUTING.md

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+# Contributing
+
+This repo is mainly used for packaging and releasing the Datadog AWS Lambda layers for [dd-trace-dotnet](https://github.com/DataDog/dd-trace-dotnet).
+Therefore, the issues and feature requests here would focus on the usage of the AWS Lambda layers. For other tracing issues or feature requests, please use [dd-trace-dotnet](https://github.com/DataDog/dd-trace-dotnet).