Initialize PHY Codex workflow

.gitignore

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+# Unreal build output
+Binaries/
+DerivedDataCache/
+Intermediate/
+Saved/
+
+# Project content policy: only track Content/AGame and its children.
+Content/*
+!Content/AGame/
+!Content/AGame/**
+
+# Visual Studio and Rider
+.vs/
+.idea/
+*.sln.DotSettings.user
+*.VC.db
+*.VC.opendb
+*.opensdf
+*.sdf
+*.suo
+*.user
+*.userosscache
+*.rsuser
+
+# Unreal local files
+*.tmp
+*.log
+*.pid
+*.sublime-workspace
+*.code-workspace
+
+# OS files
+Thumbs.db
+Desktop.ini
+.DS_Store