update README with busybox http method

README.md

@@ -1,6 +1,19 @@
 # simple-nc-server
+
+## Ncat
+
 Only works with Ncat versions that are compiled with the `-c` switch.
 
 ```sh
 while true; do nc -lnp 1337 -c 'read REQ; GET=$(echo $REQ | sed -E "s/GET \/(.*) HTTP.*/\1/"); echo -e "HTTP/1.1 200 OK\nContent-Type: text/html; charset=UTF-8\n\n"; eval "$(echo "%>$(cat index.sh.html)<%" | sed -e "s/<%=/<%echo /g" -e "s/<%/\nRAW\n/g" -e "s/%>/\ncat <<- RAW\n/g")"'; done
 ```
+
+## Busybox httpd
+
+If Busybox was compiled with `httpd`, it can serve simple scripts. If there is no `index.html` it tries `cgi-bin/index.cgi` next using whatever is in the shebang. It can be further customized by having a `httpd.conf` around but keeping it minimal, this works in this repo:
+
+```sh
+busybox httpd -p 1337 -f
+```
+
+_(Note: Alpine Linux now splits Busybox into multiple packages: `apk add busybox-extras`)_