add default template

Author: katarinasupe

.github/pull_request_template.md

@@ -0,0 +1,22 @@
+### Release note
+
+Please briefly explain the changes you made which will be added to the changelog.
+
+### Related product PRs
+
+PRs from product repo this doc page is related to: 
+(paste the links to the PRs)
+
+### Checklist:
+
+- [ ] Add appropriate milestone (current release cycle)
+- [ ] Add `bugfix` or `feature` label, based on the product PR type you're documenting
+- [ ] Make sure all relevant tech details are documented
+    - [ ] Update reference pages (e.g. [clauses](https://memgraph.com/docs/querying/clauses), [functions](https://memgraph.com/docs/querying/functions), [flags](https://memgraph.com/docs/database-management/configuration#list-of-configuration-flags), [experimental](https://memgraph.com/docs/database-management/experimental-features), [monitoring](https://memgraph.com/docs/database-management/monitoring), [Cypher differences](https://memgraph.com/docs/querying/differences-in-cypher-implementations))
+    - [ ] Search for the feature you are working on (mentions) and make updates if needed
+    - [ ] Provide a basic example of usage
+    - [ ] In case your feature is an Enterprise one, list it under [ME page](https://memgraph.com/docs/database-management/enabling-memgraph-enterprise) and mark its page with Enterprise ([example](https://memgraph.com/docs/database-management/authentication-and-authorization/role-based-access-control)).
+- [ ] Check all content with Grammarly
+- [ ] Perform a self-review of my code
+- [ ] The build passes locally
+- [ ] My changes generate no new warnings or errors