Create pull request template for contributions

Added a pull request template to guide contributors in providing necessary information and tasks.

Signed-off-by: Anycodes <service@52exe.cn>

Author: anycodes

PULL_REQUEST_TEMPLATE.md

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+> Thank you for creating a pull request to contribute to Serverless Devs agentrun-sdk-python code! Before you open the request please answer the following questions to help it be more easily integrated. Please check the boxes "[ ]" with "[x]" when done too.
+> Please select one of the PR types below to complete 
+
+---------------------
+
+## Fix bugs
+
+**Bug detail**
+> The specific manifestation of the bug or the associated issue.
+
+**Pull request tasks**
+- [ ] Add test cases for the changes
+- [ ] Passed the CI test
+
+---------------------
+
+## Update docs
+
+**Reason for update**
+> Why do you need to update your documentation?
+
+**Pull request tasks**
+- [ ] Update Chinese documentation
+- [ ] Update English documentation
+
+---------------------
+
+## Add contributor
+
+**Contributed content**
+- [ ] Code
+- [ ] Document
+
+**Content detail**
+```
+if content_type == 'code' || content_type == 'document':
+    please tell us `PR url`，like: https://github.com/Serverless-Devs/agentrun-sdk-python/pull/1
+else:
+    please describe your contribution in detail
+```
+
+---------------------
+
+## Others
+
+**Reason for update**
+> Why do you need to update your documentation?