https if not enabled

Author: chrisjsimpson

README.md

@@ -19,6 +19,12 @@ Enable ping
 sed -i 's$//#define PING_CMD$#define PING_CMD$' config/general.h
 ```
 
+Enable https
+edit `config/general.h` and ensure: `#define DOWNLOAD_PROTO_HTTPS        /* Secure Hypertext Transfer Protocol */`
+
+See https://ipxe.org/buildcfg/download_proto_https 
+
+
 Embed the demo iPXE boot script
 ```
 cat <<EOT > demo.ipxe