Update README with installation and usage details

Added installation instructions and usage examples.

Author: Relkci

README.md

@@ -1,9 +1,18 @@
 # Wigle2KML-py
 coverts wigle's API json output to KML for Geo / Google Earth
 
+## Install /w PIP, if you want
+```
+pip install wigle2kml-py
+# then use wigle2kml
+```
+
+
 There are other similar tools, this one is pretty simple.  
 ```python
 python3 wigle2kml.py filename.json output.kml
+# or
+wigle2kml filename.json output.kml
 ```
 The KML file can then be imported into Google Earth or other tools that support KML