Add more pleasantries #2

App should say "You're welcome", "No sweat", or "My pleasure", when thanked for the service.

A hello response would also be good. Something like this:

    if (mem.eql(u8, query, "hello")) {
        try stdOut.writer().print("Welcome\n", .{});
    }

A hello response would also be good. Something like this: ``` if (mem.eql(u8, query, "hello")) { try stdOut.writer().print("Welcome\n", .{}); } ```

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