app: add initial files

app/driver.zig

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+pub const Default = LinkLocal;
+pub const LinkLocal = @import("driver/LinkLocal.zig");

app/driver/LinkLocal.zig

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+// TODO: Implement.

app/main.zig

@@ -0,0 +1 @@
+// TODO: Implement.

app/os/Clock.zig

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+const std = @import("std");
+const Timer = std.time.Timer;
+const Clock = @import("../Clock.zig");
+
+const Self = @This();
+
+timer: Timer,
+
+pub fn init() Timer.Error!Self {
+    return .{
+        .timer = try Timer.start(),
+    };
+}
+
+pub fn monotonicMicros(ptr: *anyopaque) u64 {
+    const self: *Self = @ptrCast(@alignCast(ptr));
+    return self.timer.read();
+}
+
+pub fn clock(self: *Self) Clock {
+    return .{
+        .ptr = self,
+        .monotonicMicrosFn = monotonicMicros,
+    };
+}

app/os/Os.zig

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+const std = @import("std");
+const Timer = std.time.Timer;
+const System = @import("../System.zig");
+
+pub const Clock = @import("os/Clock.zig");
+pub const Rng = @import("os/Rng.zig");
+
+const Self = @This();
+
+clock: Clock,
+rng: Rng,
+
+pub fn init() Timer.Error!Self {
+    return Self{
+        .clock = try Clock.init(),
+        .rng = Rng.init(),
+    };
+}
+
+pub fn system(self: *Self) System {
+    return System{
+        .clock = self.clock.clock(),
+        .rng = self.rng.rng(),
+    };
+}

app/os/Rng.zig

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+const std = @import("std");
+const Rng = @import("../../System.zig").Rng;
+
+const Self = @This();
+
+pub fn init() Self {
+    return .{};
+}
+
+pub fn rng(self: *Self) Rng {
+    _ = self;
+    return std.crypto.random;
+}