Create base_template.md

### Added
* Create new template for pull requests

.github/PULL_REQUEST_TEMPLATE/base_template.md

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+### Added
+*
+
+### Changed
+*
+
+### Fixed
+*
+
+
+**Steps to consider while deploying**
+- Configuration changes:
+- Documentation updates:
+- Inform users by email:
+
+### Review:
+- [ ] Code approved by
+- [ ] Tests executed on stage by:  (Document the test done with screen shots and description.)
+- [ ] "Merge and deploy" approved by
+
+This [version](https://semver.org/) is a:
+- [ ] **MAJOR** - when you make incompatible API changes
+- [ ] **MINOR** - when you add functionality in a backwards compatible manner
+- [ ] **PATCH** - when you make backwards compatible bug fixes or documentation/instructions