Add gitignore and LFS config

.gitattributes

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+# Unreal assets
+*.uasset filter=lfs diff=lfs merge=lfs -text
+*.umap   filter=lfs diff=lfs merge=lfs -text
+*.ubulk  filter=lfs diff=lfs merge=lfs -text
+*.uexp   filter=lfs diff=lfs merge=lfs -text
+
+# 3D / texture / audio / video sources
+*.fbx    filter=lfs diff=lfs merge=lfs -text
+*.blend  filter=lfs diff=lfs merge=lfs -text
+*.png    filter=lfs diff=lfs merge=lfs -text
+*.jpg    filter=lfs diff=lfs merge=lfs -text
+*.tga    filter=lfs diff=lfs merge=lfs -text
+*.psd    filter=lfs diff=lfs merge=lfs -text
+*.wav    filter=lfs diff=lfs merge=lfs -text
+*.mp3    filter=lfs diff=lfs merge=lfs -text
+*.mp4    filter=lfs diff=lfs merge=lfs -text

.gitignore

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+# Build outputs / generated
+Binaries/
+Intermediate/
+Saved/
+DerivedDataCache/
+Build/
+*.VC.db
+*.opensdf
+*.opendb
+*.sdf
+*.sln
+*.suo
+*.xcodeproj
+*.xcworkspace
+
+# IDE
+.vs/
+.idea/
+.vscode/
+
+# Plugins (project plugins)
+Plugins/*/Binaries/
+Plugins/*/Intermediate/