Updated readme with usage examples

README.md

@@ -1,3 +1,18 @@
 # go-pocsag
 
 A parser for POCSAG pager protocol implemented in Go
+
+## Usage
+Read a recorded wav file `gopocsag -i path/to/file.wav`
+
+Listen to stream from rtl_fm: `rtl_fm -f <freq> -E deemp | gopocsag`
+
+Parse a raw datadump: `cat dump.bin | gopocsag`
+
+## Options
+* `--type` force message parsing type, one of `auto` `bcd` `alpha`
+* `--debug` print debugging and extra information about transmission.
+* `--verbosity` regulate the detail of debugging information
+
+## Resource usage
+Not much. About 0.2% of a i5 during normal operations. Just above 5 mb of RAM.