Add the XRController sample.

Samples~/XRController/.gitignore

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+/[Mm]emoryCaptures/
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+# Recordings can get excessive in size
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+# Uncomment this line if you wish to ignore the asset store tools plugin
+# /[Aa]ssets/AssetStoreTools*
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+# Autogenerated Jetbrains Rider plugin
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+
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+
+# Unity3D generated file on crash reports
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+
+# Builds
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+*.aab
+*.unitypackage
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+# Crashlytics generated file
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+# Packed Addressables
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+
+# Temporary auto-generated Android Assets
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Samples~/XRController/Assets/Controller/Material/Controller.mat

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