convert submodules to normal folders for now

znoise/README.md

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+# [znoise](https://github.com/zig-gamedev/znoise)
+
+Zig build package and bindings for [FastNoiseLite](https://github.com/Auburn/FastNoiseLite)
+
+## Getting started
+
+Example `build.zig`:
+
+```zig
+pub fn build(b: *std.Build) void {
+    const exe = b.addExecutable(.{ ... });
+
+    const znoise = b.dependency("znoise", .{});
+    exe.root_module.addImport("znoise", znoise.module("root"));
+    exe.linkLibrary(znoise.artifact("FastNoiseLite"));
+}
+```
+
+Now in your code you may import and use znoise:
+
+```zig
+const znoise = @import("znoise");
+
+pub fn main() !void {
+    ...
+    {
+        const gen = znoise.FnlGenerator{};
+        const n2 = gen.noise2(0.1, 0.2);
+        const n3 = gen.noise3(1.0, 2.0, 3.0);
+
+        var x: f32 = 1.0;
+        var y: f32 = 2.0;
+        var z: f32 = 3.0;
+        gen.domainWarp3(&x, &y, &z);
+    }
+
+    {
+        const gen = znoise.FnlGenerator{
+            .seed = 1337,
+            .frequency = 0.01,
+            .noise_type = .opensimplex2,
+            .rotation_type3 = .none,
+            .fractal_type = .none,
+            .octaves = 3,
+            .lacunarity = 2.0,
+            .gain = 0.5,
+            .weighted_strength = 0.0,
+            .ping_pong_strength = 2.0,
+            .cellular_distance_func = .euclideansq,
+            .cellular_return_type = .distance,
+            .cellular_jitter_mod = 1.0,
+            .domain_warp_type = .opensimplex2,
+            .domain_warp_amp = 1.0,
+        };
+        const n = gen.noise2(0.1, 0.2);
+    }
+}
+```