Add USD language (#278)

* Added USD context support

* Added USD as a supported language

* Added more USD context rules

* Added test/test.usd

README.md

@@ -73,6 +73,7 @@ use 'nvim-treesitter/nvim-treesitter-context'
   - [x] `toml`
   - [x] `tsx`
   - [x] `typescript`
+  - [x] `usd`
   - [x] `verilog`
   - [x] `vim`
   - [x] `yaml`

queries/usd/context.scm

@@ -0,0 +1,5 @@
+([
+  (prim_definition)
+  (variant_set_definition)
+  (variant)
+] @context)

test/test.usd

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+def Xform "thing"
+{
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+    def "thing" {}
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+    def Scope "child"
+    {
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+        variantSet "thing" = {
+            "stuff" {
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+                def Scope "more_child_001"
+                {
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+                }
+            }
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+        }
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+    }
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+}