Add TODO.md.

TODO.md

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+### misc
+
+- create the unix socket directory
+- close the connection and log when we receive too big messages
+- decide then explicitely document what the max message size should be
+- rx message buffer should be small but should grow if required
+- some functions are not exposed in the bindings, mostly functions related to switching
+
+### makefile
+
+- release
+- distribution
+
+### documentation
+
+- document the two ways to use LibIPC: either within some Zig code or through the bindings
+- manpages for ipcd, tcpd, pong, pongd
+
+### src/exchange-fd.zig
+
+- still very WIP, even though it works as expected
+- recvmsg is a very *stupid* copy of the sendmsg fn, **EXPECT ERRORS** (if used outside libipc)
+- at least one memory error when using Cmsghdr (see below)
+
+	==32374== Syscall param sendmsg(msg.msg_control) points to uninitialised byte(s)
+	==32374==    at 0x40554A3: ??? (in /lib/ld-musl-x86_64.so.1)
+	==32374==    by 0x40526F9: ??? (in /lib/ld-musl-x86_64.so.1)
+	==32374==    by 0x4096B83: ???
+	==32374==  Address 0x1ffefff384 is on thread 1's stack
+	==32374==  Uninitialised value was created by a client request
+	==32374==    at 0x289769: exchange-fd.Cmsghdr(i32).init (exchange-fd.zig:39)
+	==32374==    by 0x2808F0: exchange-fd.send_fd (exchange-fd.zig:86)
+	==32374==    by 0x27EA97: ipcd.create_service (ipcd.zig:178)
+	==32374==    by 0x28117C: ipcd.main (ipcd.zig:224)
+	==32374==    by 0x28161E: callMain (start.zig:614)
+	==32374==    by 0x28161E: initEventLoopAndCallMain (start.zig:548)
+	==32374==    by 0x28161E: callMainWithArgs (start.zig:498)
+	==32374==    by 0x28161E: main (start.zig:513)