add issue and pr template (#157) (#158)

Signed-off-by: birdstorm <samuelwyf@hotmail.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG] Title of Bug Report"
+labels: type/bug
+assignees: ''
+
+---
+
+**Describe the bug**
+<!-- A clear and concise description of what the bug is. -->
+
+**What did you do**
+<!--
+If possible, please provide a code receipt to produce this issue.
+ -->
+
+**What do you expect**
+<!-- A clear and concise description of what you expected to happen. -->
+
+**What happens instead**
+<!-- If an error occurs, please provide complete error stack. -->
+
+<!--
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+ -->
+
+**Java Client and TiDB/TiKV version info**
+<!-- What version of Spark and TiSpark are you using? (Provide Spark version and run `spark.sql(“select ti_version()”).show(false)` in spark-shell) -->
+
+<!--
+**Additional context**
+Add any other context about the problem here.
+You may also provide TiDB version here if it is related to the issue.
+-->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: type/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.

.github/pull_request_template.md

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+### What problem does this PR solve? <!--add issue link with summary if exists-->
+
+
+### What is changed and how it works?
+
+
+### Check List <!--REMOVE the items that are not applicable-->
+
+Tests <!-- At least one of them must be included. -->
+
+ - Unit test
+ - Integration test
+ - Manual test (add detailed scripts or steps below)
+ - No code
+
+Code changes
+
+ - Has exported function/method change
+ - Has exported variable/fields change
+ - Has interface methods change
+ - Has persistent data change
+
+Side effects
+
+ - Possible performance regression
+ - Increased code complexity
+ - Breaking backward compatibility
+
+Related changes
+
+ - Need to cherry-pick to the release branch
+ - Need to update the documentation
+ - Need to be included in the release note