tezos: added Readme

Signed-off-by: Adrian Matejov <adrian.matejov@simplestaking.com>

src/apps/tezos/README.md

@@ -0,0 +1,21 @@
+# Tezos
+
+Tezos documentation can be found [here](http://tezos.gitlab.io).
+
+## Operations
+
+Tezos allows users to use multiple curves for private key derivation, but we support
+only `ed25519` (because it is the most used one) where addresses are prefixed with `tz1`,
+public keys with `edpk` and signatures with `edsig`. Other curves might be added later on.
+
+Trezor supports basic Tezos user operations - reveal, transaction, origination, delegation.
+When the account creates first operation in lifetime, reveal has to be bundled
+with this operation to reveal account's public key.
+
+#### Operations Explorer
+
+[TzScan](http://tzscan.io)
+
+## Tests
+
+Unit tests are located in the `tests` directory, device tests are in the python-trezor repository.