chores: PR template

Author: sushantdhiman

.github/ISSUE_TEMPLATE.md

@@ -22,7 +22,6 @@ _But the output was bar!_
 
 _Output, either JSON or SQL_
 
-
 __Dialect:__ mysql / postgres / sqlite / mssql / any
 __Database version:__ XXX
 __Sequelize CLI version:__ XXX

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,23 @@
+<!--
+Please fill in the template below.
+If unsure about something, just do as best as you're able.
+
+You may skip the template below, if
+ - You are only updating documentation
+ - You are only fixing minor issue, which does not impact public API
+-->
+
+### Pull Request check-list
+
+_Please make sure to review and check all of these items:_
+
+- [ ] Does `npm run test` pass with this change (including linting)?
+- [ ] Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
+- [ ] Have you added new tests to prevent regressions?
+- [ ] Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
+
+<!-- NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open. -->
+
+### Description of change
+
+<!-- Please provide a description of the change here. -->