Add Zig build file

build.zig

@@ -0,0 +1,11 @@
+const std = @import("std");
+
+pub fn build(b: *std.build.Builder) void {
+    const target = b.standardTargetOptions(.{});
+    const lib = b.addStaticLibrary("hydrogen", null);
+    lib.addCSourceFile("hydrogen.c", &.{});
+    lib.setBuildMode(.ReleaseSmall);
+    lib.setTarget(target);
+    lib.strip = true;
+    lib.install();
+}