Update GitUsage.md

GitUsage.md

@@ -0,0 +1,16 @@
+# From Scratch
+## Create a new repo
+Name it yourmission.mapname eg FashionPolice.gm_weferlingen_summer
+## Clone your repo
+From command line, while in Documents\Arma 3 - Other Profiles\myname\missions: git clone https://devteam.austac.net/AusTac/FashionPolice.gm_weferlingen_summer
+Or clone using your GUI of choice to that location
+Tip: while in windows file explorer, type cmd.exe into the path bar to open command line in that folder
+
+## Copy a blank mission.sqm into the repo
+Make a new mission (on the same map), name it blank.mapname. Save it unbinarized, then copy the sqm into the repository folder.
+At this point I also open the sqm up in notepad and change sourceName to my mission name.
+
+## Commit and Push your intial mission.sqm
+From command line: git add mission.sqm
+git commit -m "Added initial mission"
+git push