Update README.md

README.md

@@ -79,16 +79,47 @@ make html
 
 
 ## 5. Developer guide
-### GitHub refresher for those who would like to contribute
+
+### GitHub refresher
 #### Push new changes
-```bash
+
+```
 git status
 git pull
 git add -A .
 git commit -m "Change a specific functionality"
 git push -u origin main
 ```
 
+#### Making a pull request
+```
+git checkout main
+git pull
+
+# Before you begin making changes, create a new branch
+git checkout -b new-feature-branch
+git add -A
+git commit -m "Detailed commit message describing the changes"
+git push -u origin new-feature-branch
+
+# Visit github.com to add description, submit, merge the pull request
+
+# Once finished on github.com, return to local
+git checkout main
+git pull
+
+# Delete the remote branch
+git branch -d new-feature-branch
+```
+
+#### Handle merge conflict
+
+```
+git stash push --include-untracked
+git stash drop
+git pull
+```
+
 
 ### Copyright