added README

Protocol/README.md

+# Building
+
+1. Download the boost framework http://www.boost.org/users/download/
+2. Set environment variable `BOOST_ROOT` to the boost root directory
+3. In the Protocol directory create a build directory:
+
+    `mkdir cmake-build-debug`
+
+4. Run cmake:
+
+    `cmake --build "cmake-build-debug" --target Protocol -- -j 2`
+
+# Documentation
+
+Run leader:
+
+    ```cpp
+    // Create a leader vehicle instance.
+    LeaderVehicle leader(1);    // 1 = vehicle id
+    // Starts the vehicle thread so this method returns instantly.
+    // All operations like createPlatoon(), leavePlatoon() are asynchronous operations.
+    // This means they either return instantly with return value "true" or are ignored with return value "false".
+    leader.run();
+    // Automatically tries to create a platoon with a vehicle specified in the method Vehicle::scanAvailableVehicles().
+    leader.createPlatoon();
+    // Do stuff ...
+    // No need to call leader.stop(), since destructor does all the disconnection and cleanup work automatically.
+    ```
+
+Run follower:
+Just replace the class `LeaderVehicle` with `FollowerVehicle`.
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