A bit more refactoring and hook up some cli functions

README.md

@@ -1,13 +1,39 @@
 # ais-tools
 Tools for reading and writing AIS messages
 
-
 ## Install
 ```console
-git clone https://github.com/SkyTruth/ais-tools
-pip install ais-tools/
+pip install git+https://github.com/GlobalFishingWatch/ais-tools
 ```
+## Command line usage
 
+```console
+ais_tools --help
+```
+
+Decode nmea in a file as json to stdout
+```
+ais_tools decode ./sample/sample.nmea
+```
+
+## Python usage
+Decode NMEA
+```python
+import json
+from ais_tools.aivdm import AIVDM
+
+
+nmea = [
+    '\\c:1599239526500,s:sdr-experiments,T:2020-09-04 18.12.06*5D\\!AIVDM,1,1,,A,B>cSnNP00FVur7UaC7WQ3wS1jCJJ,0*73',
+    '\\c:1599239587658,s:sdr-experiments,T:2020-09-04 18.13.07*58\\!AIVDM,1,1,,B,H>cSnNP@4eEL544000000000000,0*3E',
+    '\\c:1599239644720,s:sdr-experiments,T:2020-09-04 18.14.04*5E\\!AIVDM,1,1,,B,H>cSnNTU7B=40058qpmjhh000004,0*31',
+]
+
+decoder = AIVDM()
+
+for msg in decoder.decode_stream(nmea):
+    print(json.dumps(msg))
+```
 ## Developing
 
 ```console