add github template helping report issues and submit pull request

.github/ISSUE_TEMPLATE.md

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+<!--
+If you are reporting a new issue, make sure that we do not have any duplicates
+already open. You can ensure this by searching the issue list for this
+repository. If there is a duplicate, please close your issue and add a comment
+to the existing issue instead.
+
+If you suspect your issue is a bug, please edit your issue description to
+include the BUG REPORT INFORMATION shown below. If you fail to provide this
+information within 7 days, we cannot debug your issue and will close it. We
+will, however, reopen it if you later provide the information.
+
+For more information about reporting issues, see
+https://github.com/Azure/SONiC/wiki#report-issues
+
+---------------------------------------------------
+GENERAL SUPPORT INFORMATION
+---------------------------------------------------
+
+The GitHub issue tracker is for bug reports and feature requests.
+General support can be found at the following locations:
+
+- SONiC Support Forums - https://groups.google.com/forum/#!forum/sonicproject
+
+---------------------------------------------------
+BUG REPORT INFORMATION
+---------------------------------------------------
+Use the commands below to provide key information from your environment:
+You do NOT have to include this information if this is a FEATURE REQUEST
+-->
+
+**Description**
+
+<!--
+Briefly describe the problem you are having in a few paragraphs.
+-->
+
+**Steps to reproduce the issue:**
+1.
+2.
+3.
+
+**Describe the results you received:**
+
+
+**Describe the results you expected:**
+
+
+**Additional information you deem important:**
+<!--
+software/ASIC/Hardware Flatform version and info
+-->
+    **Output of `show version`:**
+
+    ```
+    (paste your output here)
+    ```
+
+    **Attach debug file `sudo generate_dump`:**
+
+    ```
+    (paste your output here)
+    ```

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Please make sure you've read and understood our contributing guidelines;
+https://github.com/Azure/SONiC/blob/gh-pages/CONTRIBUTING.md
+
+Please provide following information to help code review process a bit easier:
+-->
+### Description of PR
+<!--
+- Please include a summary of the change and which issue is fixed.
+- Please also include relevant motivation and context. Where should reviewer start? background contaxt?
+- List any dependencies that are required for this change.
+-->
+Fixes # (issue)
+
+### Type of change
+- [ ] Bug fix
+- [ ] Testbed and Framework(new/improvement)
+- [ ] Test case(new/improvement)
+
+### Approach
+How did you do it?
+How did you verify/test it?
+Any platform specific information?
+Supported testbed topology if it's a new test case?
+
+### Documentation 
+<!--
+(If it's a new feature, new test case)
+Did you update documentation/Wiki relevant to your implementation?
+Link to the wiki page?
+-->