chore: implement initial bot with substitute command

This commit introduces a Bot struct which is the main type of this
project. The Bot holds a backlog of messages to be able to update a
typo in a message and so on.

So far there is no IRC/TLS implementation, it is only the base logic.

src/root.zig

@@ -1,23 +1,3 @@
 //! By convention, root.zig is the root source file when making a library.
 const std = @import("std");
-
-pub fn bufferedPrint() !void {
-    // Stdout is for the actual output of your application, for example if you
-    // are implementing gzip, then only the compressed bytes should be sent to
-    // stdout, not any debugging messages.
-    var stdout_buffer: [1024]u8 = undefined;
-    var stdout_writer = std.fs.File.stdout().writer(&stdout_buffer);
-    const stdout = &stdout_writer.interface;
-
-    try stdout.print("Run `zig build test` to run the tests.\n", .{});
-
-    try stdout.flush(); // Don't forget to flush!
-}
-
-pub fn add(a: i32, b: i32) i32 {
-    return a + b;
-}
-
-test "basic add functionality" {
-    try std.testing.expect(add(3, 7) == 10);
-}
+pub const bot = @import("bot.zig");