update readme

Makefile

@@ -1,5 +1,5 @@
 build:
-	env GOOS=linux GOARCH=arm64 go build -o pifi main.go
+	env GOOS=linux GOARCH=${ARCH} go build -o pifi main.go
 
 upload:
 	scp pifi pi@rpi-40ac:/home/pi/pifi

README.md

@@ -1,6 +1,6 @@
 # PiFi
 
-This is a simple tool to create and manage a hotspot on a Raspberry Pi (ARM64).  
+This is a simple tool to create and manage a hotspot with NetworkManager through DBUS.  
 The code is based on https://github.com/NetworkManager/NetworkManager/blob/main/examples/python/dbus/wifi-hotspot.py, rewritten in Go and adds following features:
 
 - Environment variables or intput parameters for SSID and password
@@ -9,7 +9,7 @@ The code is based on https://github.com/NetworkManager/NetworkManager/blob/main/
 ## Build
 
 ```bash
-make build
+make build ARCH=arm64
 ```
 
 ## Usage