[feat] Added PR template

Author: AdarshRawat1

.github/pull_request_template.md

@@ -0,0 +1,13 @@
+### Describe the changes you have made in this PR
+
+_A clear and concise description of what you want to happen_
+
+### Link this PR to an issue [optional]
+
+Fixes _#ISSUE-NUMBER_
+
+### Checklist
+
+- [ ] Self-review of changed code
+- [ ] Added automated tests where applicable
+- [ ] Update Docs & Guides

.gitignore

@@ -1,5 +1,6 @@
 .idea*
-.github*
+.github/*
+!.github/pull_request_template.md
 __pycache__/
 *.nii.gz
 bvals.txt