[usd] Add custom usage file with CMake and plugin deployment guidance

The auto-generated usage only mentions TBB::tbb and omits USD library targets. Document find_package(pxr), typical link targets, and runtime plugin/plugInfo.json deployment requirements.

Signed-off-by: Jackson Sun <Jackson.Sun@autodesk.com>

ports/usd/portfile.cmake

@@ -130,3 +130,5 @@ endif()
 
 # Handle copyright
 vcpkg_install_copyright(FILE_LIST ${SOURCE_PATH}/LICENSE.txt)
+
+file(INSTALL "${CMAKE_CURRENT_LIST_DIR}/usage" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}")

ports/usd/usage

@@ -0,0 +1,30 @@
+usd provides CMake targets:
+
+  find_package(pxr CONFIG REQUIRED)
+  target_link_libraries(main PRIVATE usd sdf usdGeom)
+
+  # pxr exports many library targets (usd, sdf, tf, gf, usdGeom, usdShade,
+  # usdLux, ...) without a namespace prefix. Link only the libraries your
+  # application needs.
+
+USD discovers plugins at runtime via plugInfo.json registries. When deploying
+an application, copy the USD libraries and plugin directories from the vcpkg
+installed tree:
+
+  Windows:
+    bin/*.dll         (core USD libraries)
+    lib/*.lib         (import libraries)
+    bin/usd/          (top-level plugInfo.json and core library resource registries)
+    plugin/usd/       (MODULE plugin DLLs)
+
+  Unix:
+    lib/*.so*         (USD libraries you linked against, and their dependencies)
+    lib/usd/          (top-level plugInfo.json and core library resource registries)
+    plugin/usd/       (MODULE plugin shared objects)
+
+On Windows, the top-level plugInfo.json must be deployed under bin/usd/ next to
+the USD libraries so Plug can discover core library plugins.
+
+Optional port features install additional MODULE plugins under plugin/usd/.
+For example, imaging adds Hydra and imaging plugins, and openimageio adds the
+hioOiio image I/O plugin.

ports/usd/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "usd",
   "version": "26.8",
-  "port-version": 1,
+  "port-version": 2,
   "description": "Universal Scene Description (USD) is an efficient, scalable system for authoring, reading, and streaming time-sampled scene description for interchange between graphics applications.",
   "homepage": "https://github.com/PixarAnimationStudios/OpenUSD",
   "license": null,

versions/baseline.json

@@ -10566,7 +10566,7 @@
     },
     "usd": {
       "baseline": "26.8",
-      "port-version": 1
+      "port-version": 2
     },
     "usearch": {
       "baseline": "2.25.3",

versions/u-/usd.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "78a0198e1bdbeaae929c95dc56e4cdca29e9bda3",
+      "version": "26.8",
+      "port-version": 2
+    },
     {
       "git-tree": "6e450855d40c813b9e8e936f1ea3794ac419d744",
       "version": "26.8",