add pull request template (#768)

.github/pull_request_template.md

@@ -0,0 +1,39 @@
+### Description
+
+<!---
+  Please include a brief description of changes if not obvious from the PR title
+
+  Does this work have a corresponding ticket?
+
+  Please link your Jira ticket by including it in one of the following reference:
+    - the PR title
+    - branch name
+    - commit message
+    - PR description
+  
+  Example:
+
+  [LINK-777](https://smartcontract-it.atlassian.net/browse/LINK-777)
+--> 
+
+### Requires Dependencies
+<!---
+  Does this work depend on other open PRs?
+
+  Please list other PRs that are blocking this PR.
+
+  Example:
+
+  - https://github.com/smartcontractkit/chainlink-common/pull/7777777
+-->
+
+### Resolves Dependencies
+<!---
+  Does this work support other open PRs? 
+
+  Please list other PRs that are waiting for this PR to be merged.
+
+  Example:
+
+  - https://github.com/smartcontractkit/ccip/pull/7777777
+-->