Add Config structure, TOML parser, and tests for zocket configuration

src/main.zig

@@ -1,8 +1,7 @@
-const std = @import("std");
-const Io = std.Io;
-
 const zocket = @import("zocket");
 
+const std = @import("std");
+
 pub fn main(init: std.process.Init) !void
 {
     _ = init;