Update git/overall.md

git/overall.md

@@ -13,4 +13,38 @@ git switch 'branch'
 # A new branch
 ```
 git switch -c 'branch'
-```
+```
+
+
+## Creating a new repository on the command line
+```
+touch README.md
+```
+```
+git init
+```
+```
+git checkout -b main
+```
+```
+git add README.md
+```
+```
+git commit -m "first commit"
+```
+```
+git remote add origin git-https-url
+```
+```
+git push -u origin main
+```
+
+## Pushing an existing repository from the command line
+
+```
+git remote add origin git-https-url
+```
+```
+git push -u origin main
+```
+