created new why2-chat module

src/chat/README

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+WHY2-Chat's Client & Server
+===========================
+
+*In development, do not use.*
+
+WHY2's Chat is another encrypted and completely private communication.
+All messages are encrypted with WHY2 and only you know the key (even the server can't decrypt the messages).
+
+I am not responsible for any abuse of privacy.

src/chat/client/main.c

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+#include <stdio.h>
+
+int main(void)
+{
+    printf("Here will be client...\n");
+
+    return 0;
+}

src/chat/server/main.c

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+#include <stdio.h>
+
+int main(void)
+{
+    printf("Here will be server...\n");
+
+    return 0;
+}