try markdown syntax highlighting

README.md

@@ -12,18 +12,21 @@ So far it has modules for these domain provider APIs:
 - miniupnpc (optional, see the Configuration section)
 
 # Installation
+
 TBD
 
 # Configuration
-The configuration options are described in `homeserverdns.cfg`. First a protocol has to be defined, e.g.
+All configuration options are described in more detail in `homeserverdns.cfg`. This is only an overview on the most important options.
 
-```
+First a protocol has to be defined, e.g.
+
+```shell
 protocol=gandi
 ```
 
 For authentication at the domain provider, an authentication token has to be geven. Some protocols require a user name and an API address, too.
 
-```
+```shell
 auth_key=g5Hdsfkj5J49li8HH3jfhsJp
 user= 		# not required for gandi
 api_address=	# not required for gandi
@@ -31,13 +34,13 @@ api_address=	# not required for gandi
 
 Now the domains (and subdomains) we want to update A and AAAA records for have to be defined.
 
-```
+```shell
 domains=mydomain.com sub.mydomain.com
 ```
 
 By default `UPNP` is used for detecting the server's public IPv4 address. So we should check if upnp works and returns the correct IPv4 address.
 
-```
+```shell
 $ upnpc -s
 [...]
 ExternalIPAddress = 85.98.82.44
@@ -46,6 +49,6 @@ ExternalIPAddress = 85.98.82.44
 
 If we don't get a value for `ExternalIPAddress`, we should check our router and firewall settings. If `UPNP` does not work for us (e.g. in case the server is behind a Carrier Grade NAT), we can define our own method for looking up our public IPv4 address using the `public_ip4_hook` config option, e.g. 
 
-```
+```shell
 public_ip4_hook=curl -s -4 https://ipecho.net/plain
 ```