README.md update (#324)

* Update prereqs for ARM64 python version

Signed-off-by: Jacob <jacob@torrey.io>

* Added pkgx usage info

Signed-off-by: Jacob <jacob@torrey.io>

---------

Signed-off-by: Jacob <jacob@torrey.io>

README.md

@@ -45,7 +45,8 @@ OpenCanary is the Open Source version of our commercial [Thinkst Canary](https:/
 
 ## Prerequisites
 
-* Python 3.7 (Recommended Python 3.7+)
+* AMD64: Python 3.7 (Recommended Python 3.7+)
+* ARM64: Python 3.9+
 * _Optional_ SNMP requires the Python library Scapy
 * _Optional_ Samba module needs a working installation of Samba
 * _Optional_ Portscan uses iptables (not nftables) and is only supported on Linux-based operating systems
@@ -123,6 +124,15 @@ $ cd dist
 $ pip install opencanary-<version>.tar.gz
 ```
 
+### Use via pkgx
+
+OpenCanary is packaged via [pkgx](https://pkgx.sh/), so no installation is needed if pkgx is installed, simply preface the `opencanaryd` command with
+`pkgx`. Due to environment variable protections in modern `sudo` implementations, the entire command must be run as root, or via `sudo -E`.
+
+```
+$ pkgx opencanaryd --version
+```
+
 ### Installation for Docker
 
 OpenCanary Docker images are hosted on Docker Hub. These are only useful on Linux Docker hosts, as the `host` network engine is required for accurate network information.
@@ -180,6 +190,14 @@ $ . env/bin/activate
 $ opencanaryd --start
 ```
 
+### With pkgx
+
+Start OpenCanary by running:
+
+```
+$ sudo -E pkgx opencanaryd --start
+```
+
 ### With docker-compose
 
 The route requires [Docker](https://docs.docker.com/get-docker/) and [Docker Compose](https://docs.docker.com/compose/install/) to be installed.