update readme

Author: AndyEveritt

README.md

@@ -14,3 +14,31 @@ Python interface to Duet RepRap V3 firmware via Http REST API.
 
 # Usage
 * See 'examples.py' for examples. 
+
+## REST API
+The REST API allows for the following operations:
+
+Method | Description
+------ | -----------
+`get_model(key: str = None) -> Dict` | Get Duet object model. RRF3 only
+`post_code(code: str) -> Dict` | Send G/M/T-code to Duet
+`get_file(filename: str, directory: str = 'gcodes') -> str` | Download file from Duet
+`put_file(file: str, directory: str = 'gcodes') -> Dict` | Upload file to Duet
+`get_fileinfo(filename: str = None, directory: str = 'gcodes') -> Dict` | Get file info
+`delete_file(filename: str, directory: str = 'gcodes') -> Dict` | Delete file on Duet
+`move_file(from_path: str, to_path: str, force: bool = False) -> Dict` | Move file on Duet, can be used to rename files
+`get_directory(directory: str) -> List[Dict]` | Get a list of all the files & directories in a directory
+`put_directory(directory: str) -> Dict` | Create a new directory
+
+
+## Wrapper
+An additional wrapper is provided to make repetative tasks easier
+
+Method | Description
+------ | -----------
+`get_coords()` | return the current position of all the movement axes
+`get_layer()` | return the current layer number of the print
+`get_num_extruders()` | return the number of extruders currently configured
+`get_num_tools()` | return the number of tools currently configured
+`get_status()` | return the current Duet status
+`get_temperature()` | return a list of all the analog sensors and their value