Add install instructions for arch
Add install instructions for arch

Signed-off-by: Eli Skeggs <6f1bd7612aad69a03075b8a4c55d06eca90ace64@globesherpa.com>
skeggse/node-rijndael,worldline/node-rijndael,worldline/node-rijndael,worldline/node-rijndael,skeggse/node-rijndael,worldline/node-rijndael,worldline/node-rijndael,nguyer/node-rijndael,nguyer/node-rijndael,skeggse/node-rijndael,nguyer/node-rijndael,nguyer/node-rijndael,skeggse/node-rijndael,skeggse/node-rijndael,worldline/node-rijndael