Improve project initialisation

platformio/exception.py

@@ -48,6 +48,13 @@ class PlatformNotInstalledYet(PlatformioException):
         "Use `platformio platforms install` command"
 
 
+class BoardNotDefined(PlatformioException):
+
+    MESSAGE = "You need to specify board type using `-b` or `--board` "\
+        "option. Supported boards list is available via "\
+        " `platformio boards` command"
+
+
 class UnknownBoard(PlatformioException):
 
     MESSAGE = "Unknown board type '%s'"