Create pull_request_template.md

added PR template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+## Description
+
+<!-- Please include a summary of changes made in your pull request. -->
+
+<!-- If you can't fill all check boxes in Checklists section, please explain why. -->
+
+## Checklists
+
+<!-- Fill check boxes before submitting the pull request. -->
+
+### Testing
+
+#### General
+
+- [ ] I have checked that my test files and functions have meaningful names.
+- [ ] I have checked that each test tests only a single behavior.
+- [ ] I have done happy tests.
+- [ ] I have tested only my own code.
+- [ ] I have tested at least all public methods. 
+
+#### Assertions
+
+- [ ] I have checked that my tests use assertions and not runtime overhead.
+- [ ] I have checked that my tests end in assertions.
+- [ ] I have checked that there is no comparison statements in assertions.
+- [ ] I have checked that assertions are in tests and not in helper functions.
+- [ ] I have checked that assertions for iterables are outside of for loops and both sides of the iteration blocks.
+- [ ] I have checked that assertions are not tested inside consumers.
+
+#### Testing Data
+
+- [ ] I have tested algorithms and anything else with the possibility of unbound growth.
+- [ ] I have checked that all testing data is local and fully replaceable or reproducible or both.
+- [ ] I have checked that all test files are standalone.
+- [ ] I have checked that all test-specific fake objects and classes are in the test directory.
+- [ ] I have checked that my tests do not contain anything related to customers, infrastructure or users.
+- [ ] I have checked that my tests do not contain non-generic information.
+- [ ] I have checked that my tests do not do external requests and are not privately or publicly routable.
+
+#### Statements
+
+- [ ] I have checked that my tests do not use throws for exceptions.
+- [ ] I have checked that my tests do not use try-catch statements.
+- [ ] I have checked that my tests do not use if-else statements.
+
+#### Java
+
+- [ ] I have checked that my tests for Java uses JUnit library.
+- [ ] I have checked that my tests for Java uses JUnit utilities for parameters.
+
+#### Other
+
+- [ ] I have only tested public behavior and not private implementation details.
+- [ ] I have checked that my tests are not (partially) commented out.
+- [ ] I have checked that hand-crafted variables in assertions are used accordingly.
+- [ ] I have tested [Object Equality](https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html#equals%28java.lang.Object%29).
+- [ ] I have checked that I do not have any manual tests or I have a valid reason for them and I have explained it in the PR description.
+
+### Code Quality
+
+- [ ] I have checked that my code follows metrics set in Procedure: Class Metrics.
+- [ ] I have checked that my code follows metrics set in Procedure: Method Metrics.
+- [ ] I have checked that my code follows metrics set in Procedure: Object Quality.
+- [ ] I have checked that my code does not have any NULL values.
+- [ ] I have checked my code does not contain FIXME or TODO comments.