Update README.md

README.md

+## Command line instructions
+
+You can also upload existing files from your computer using the instructions below.
+
+## Git global setup
+```
+git config --global user.name "Romain MATIAS"
+git config --global user.email "["ext.exodev.rmatias@grandlyon.com"]"
+```
+
+## Create a new repository
+```
+git clone https://forge.grandlyon.com/erasme/plateforme-calque-front.git
+cd plateforme-calque-front
+git switch -c main
+touch README.md
+git add README.md
+git commit -m "add README"
+git push -u origin main
+```
+
+## Push an existing folder
+```
+cd existing_folder
+git init --initial-branch=main
+git remote add origin https://forge.grandlyon.com/erasme/plateforme-calque-front.git
+git add .
+git commit -m "Initial commit"
+git push -u origin main
+```
+
+## Push an existing Git repository
+```
+cd existing_repo
+git remote rename origin old-origin
+git remote add origin https://forge.grandlyon.com/erasme/plateforme-calque-front.git
+git push -u origin --all
+git push -u origin --tags
+```
+