Create pull_request_template.md

.github/pull_request_template.md

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+# Welcome to Javascript community
+
+### **Describe your change:**
+
+* [ ] Add an algorithm?
+* [ ] Fix a bug or typo in an existing algorithm?
+* [ ] Documentation change?
+
+
+### **Checklist:**
+* [ ] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Javascript/blob/master/CONTRIBUTING.md).
+* [ ] This pull request is all my own work -- I have not plagiarized.
+* [ ] I know that pull requests will not be merged if they fail the automated tests.
+* [ ] This PR only changes one algorithm file.  To ease review, please open separate PRs for separate algorithms.
+* [ ] All new Javascript files are placed inside an existing directory.
+* [ ] All filenames should use the UpperCamelCase (PascalCase) style.  There should be no spaces in filenames.
+     **Example:**`UserProfile.js` is allowed but `userprofile.js`,`Userprofile.js`,`user-Profile.js`,`userProfile.js` are not
+* [ ] All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
+* [ ] If this pull request resolves one or more open issues then the commit message contains `Fixes: #{$ISSUE_NO}`.