feat: Add core VN system scripts, package dependencies, and initial project settings.

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Assets/Packages/Microsoft.Bcl.AsyncInterfaces.6.0.0/lib/netstandard2.1/Microsoft.Bcl.AsyncInterfaces.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<doc>
+    <assembly>
+        <name>Microsoft.Bcl.AsyncInterfaces</name>
+    </assembly>
+    <members>
+    </members>
+</doc>

Assets/Packages/Microsoft.Bcl.AsyncInterfaces.6.0.0/lib/netstandard2.1/Microsoft.Bcl.AsyncInterfaces.xml.meta

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+TextScriptImporter:
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