added client server shared

src/shared/protocol.zig

@@ -0,0 +1,15 @@
+const std = @import("std");
+
+pub const SERVER_PORT: u16 = 1337;
+
+pub const Hello = struct {
+    msg: []const u8,
+};
+
+pub fn sendHello(writer: *std.io.Writer, hello: Hello) !void {
+    try writer.print("{s}\n", .{hello.msg});
+}
+
+pub fn recvLine(reader: *std.io.Reader) ![]u8 {
+    return try reader.takeDelimiterExclusive('\n');
+}