Update readme with some usage

Signed-off-by: Sean Young <[email protected]>

README.md

@@ -1,4 +1,6 @@
-# cir - a new implementation of ir-keytable/ir-ctl for linux
+# cir - a new implementation of linux infrared tools
+
+aka as "daemon-less lircd, ir-keytable, ir-ctl combined and much more".
 
 For Linux, there are two tools to interact with any infrared hardware:
 ir-ctl and ir-keytable. These tools can load simple infrared keymaps
@@ -20,6 +22,82 @@ express [any IR protocol](http://hifi-remote.com/wiki/index.php/DecodeIR).
 The aim is parse IRP and compile a decoder to BPF. So, any protocol can
 be supported directly.
 
+## Listing IR devices
+
+This is the cir equivalent of both `ir-keytable` with no arguments and `ir-ctl -f`.
+
+```
+cir config
+```
+
+## Transmit/Send
+
+If you have a `.lircd.conf` file or `.toml` keymap, you can send with the following
+command:
+
+```
+cir transmit keymap foo.lircd.conf KEY_CHANNELUP
+```
+Alternatively, you can send raw IR directly like so:
+```
+cir transmit rawir '+9000 -4500 +560'
+```
+You can also files or linux kernel scancodes, exactly like the `ir-ctl` tool. This supports
+mode2 files or raw IR files.
+```
+cir transmit rawir -s input-file -S nec:0xcafe
+```
+You can send pronto codes:
+```
+cir transmit pronto '5000 0073 0000 0001 0001 0001'
+```
+Lastly you use IRP notation and set the parameters. This is great for experimenting with IRP; use the `--dry-run` (`-n`)
+to avoid sending.
+```
+cir transmit irp -n -fF=2 '{40k,600}<1,-1|2,-1>(4,-1,F:8,^45m)[F:0..255]'
+```
+
+## Decoding
+
+Use this if have a `.lircd.conf` file or `.toml` keymap, and want to decode the IR, without changing
+any configation.
+
+```
+cir decode keymap foo.lircd.conf
+```
+This will infrared from the first lirc device. You can also decode IR on the command line or a file.
+
+```
+cir decode keymap foo.lircd.conf -r '+9000 -4500 +560'
+```
+or
+```
+cir decode keymap foo.lircd.conf -f input-file
+```
+
+## Configuration
+
+This is the cir equivalent of `ir-keytable -w`.
+
+```
+cir config -s rc0 -w foo.lircd.conf
+```
+This will generate a BPF decoder for `foo.lircd.conf` and load it.
+
+On startup, `ir-keytable -a -s rc0` read the correct keymap from `/etc/rc_maps.cfg`. 
+
+```
+cir auto -s rc0
+```
+
+## Test configuration
+
+This is the cir equivalent of `ir-keytable -t`
+
+```
+cir test
+```
+
 ## Status
 
 All the functionality is in place to load keymaps. More tests are needed,
@@ -28,4 +106,8 @@ and more polish. The aim is to have this done by the end of 2024.
 ## Building
 
 On Linux, cir depends on llvm for BPF code generation. On Fedora you
-need the `llvm-devel` package install and `llvm-dev` on Ubuntu.
+need the `llvm-devel` package install and `llvm-dev` on Ubuntu.
+
+```
+cargo install --git https://github.com/seanyoung/cir
+```