Added Readme.md

transmat/Readme.md

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+### How to copy files using ```transmat```
+Transphase relay server should be running and accessible by the parties. 
+On the sending party:
+```
+transmat --send <FILENAME>
+```
+This will prepare the sender and output the command to run on the receiving party, eg:
+```
+transmat --receive --password Space-Time-Continuum
+```
+
+The sending party will wait for the receiving party to connect to the relay server, and then it will start the transfer. \
+With the exception of some service messages, all the data is encrypted. \
+Encryption and decryption is done only client-side, and the relay server has no useful knowledge of the data it relays. \
+Fernet module (AES128-CBC + HMAC-SHA256) is used to encrypt and authenticate the data.
+
+See also ```transmat --help```