zig package manager - build glfw cmake project

README.md

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+Fetch GLFW via experimental zig package manager `build.zig.zon`
+
+Invoke CMake commands to build and install GLFW to zig-cache
+
+Add Zig executable which includes and links to GLFW.
+
+
+Drawing inspiration from CMake ExternalProject.
+
+----
+
+Ideally there would be some mechanism like `b.addCMakeProject` with options to:
+
+- provide CMake CLI or CACHE_ARGS
+- infer source/config/install dirs
+- infer installed libraries and linkage (pkgconfig?)
+- inf
+- set CMAKE_CXX_COMPILER to `zig c++`
+- set CMAKE_C_COMPILER to `zig c`
+- Infer modules/artifacts from installed targets.
+  - inspect/evaluate `glfw3Targets.cmake` and produce a module/artifact for each cmake target
+
+---
+
+I imagine usage like:
+
+```zig
+const glfw = b.dependency("glfw", .{
+    // automatically use zig for CMAKE_C_COMPILER, CMAKE_CXX_COMPILER
+    .target = target,  // pass on as compiler flags
+    .optimize = optimize, // convert to CMAKE_BUILD_TYPE
+    .cache_args = .{
+        "GLFW_BUILD_SHARED_LIBS:BOOL=OFF",
+        "GLFW_BUILD_WAYLAND:BOOL=OFF",
+        "GLFW_BUILD_X11:BOOL=ON",
+        "GLFW_BUILD_TESTS:BOOL=OFF",
+    },
+});
+
+exe.addModule(
+    "glfw",  // the name of the @import which defers to @cImport.
+    glfw.module("glfw"), // the name of the cmake target
+);
+exe.linkLibrary(
+    glfw.artifact("glfw"), // the name of the cmake target
+);
+```