Update README file

Added info for 'verbose' flag and updated the list of supported commands.

README.md

@@ -42,23 +42,39 @@ You should see usage information displayed like below:
     Usage: ampy [OPTIONS] COMMAND [ARGS]...
 
       ampy - Adafruit MicroPython Tool
-
+    
       Ampy is a tool to control MicroPython boards over a serial connection.
       Using ampy you can manipulate files on the board's internal filesystem and
       even run scripts.
-
+    
     Options:
-      -p, --port PORT  Name of serial port for connected board.  [required]
-      -b, --baud BAUD  Baud rate for the serial connection. (default 115200)
-      -d, --delay DELAY Delay in seconds before entering RAW MODE (default 0)
-      --help           Show this message and exit.
-
+      -p, --port PORT    Name of serial port for connected board.  Can optionally
+                         specify with AMPY_PORT environment variable.  [required]
+
+      -b, --baud BAUD    Baud rate for the serial connection (default 115200).
+                         Can optionally specify with AMPY_BAUD environment
+                         variable.
+
+      -d, --delay DELAY  Delay in seconds before entering RAW MODE (default 0).
+                         Can optionally specify with AMPY_DELAY environment
+                         variable.
+
+      -v, --verbose      Print messages to monitor the progress of the requested
+                         operation.
+
+      --version          Show the version and exit.
+      --help             Show this message and exit.
+
     Commands:
-      get  Retrieve a file from the board.
-      ls   List contents of a directory on the board.
-      put  Put a file on the board.
-      rm   Remove a file from the board.
-      run  Run a script and print its output.
+      get    Retrieve a file from the board.
+      ls     List contents of a directory on the board.
+      mkdir  Create a directory on the board.
+      put    Put a file or folder and its contents on the board.
+      reset  Perform soft reset/reboot of the board.
+      rm     Remove a file from the board.
+      rmdir  Forcefully remove a folder and all its children from the board.
+      run    Run a script and print its output.
+
 
 If you'd like to install from the Github source then use the standard Python
 setup.py install (or develop mode):