Docs: Update main readme info

Author: pedroamador

README.md

@@ -8,6 +8,30 @@ Simply Bash script to run dockerized commands.
 2. Make it executable with `chmod 777 /usr/local/bin/kd`
 3. Execute any Docker Command with `kd command-name [parameter]`
 
+Command help:
+
+```console
+$ kd
+Usage:  kd command [file_or_folder] [parameter] [parameter] [...]
+
+  command:            The Docker Command to execute, like 'hello-world' or 'git-changelog-generator'
+
+Options:
+  [file_or_folder]:   Optional file or folder to give to the container
+  [parameter]:        Optional parameters. Depends on the 'docker-command' that you are running
+
+Examples:
+
+  kd hello-world
+  kd git-changelog-generator .
+
+You can also concatenate two or more Docker Commands through a pipe
+
+Examples:
+
+  kd git-changelog-generator . | kd md2html > changelog.html
+```
+
 ## Available commands
 
 - [Hello World!](https://github.com/kairops/dc-hello-world)