Merge pull request 'added git checkout' (#17) from Steven/dev-tools-course:git_checkout into main

Reviewed-on: https://codeberg.org/mo8it/dev-tools/pulls/17

src/day_3/notes.md

@@ -58,6 +58,22 @@ git commit -m "Your commit message here"
 
 ## git checkout
 
+This command enables you to switch to another branch or to another commit.
+
+Examples are:
+
+```bash
+git checkout "branchname"
+```
+
+or
+
+```bash
+git checkout -b "branchname"
+```
+
+If you want to create a new branch and switch to it.
+
 ## git push
 
 ## git pull