all: add starting service with Control D config

docs/basic_mode.md

@@ -25,6 +25,8 @@ Usage:
 
 Flags:
       --base64_config string        base64 encoded config
+      --cache_size int              Enable cache with size items
+      --cd string                   Control D resolver uid
   -c, --config string               Path to config file
   -d, --daemon                      Run as daemon
       --domains strings             list of domain to apply in a split DNS policy

docs/controld_config.md

@@ -0,0 +1,15 @@
+# Control D config
+
+`ctrld` can build a Control D config and run with the specific resolver data.
+
+For example:
+
+```shell
+ctrld run --cd p2
+```
+
+Above command will fetch the `p2` resolver data from Control D API and use that data for running `ctrld`:
+
+ - The resolver `doh` endpoint will be used as the primary upstream.
+ - The resolver `exclude` list will be used to create a rule policy which will steer them to the default OS resolver.
+```