README.md updated

Author: David Revelo

README.md

@@ -1,2 +1,24 @@
 # exec_dialog
 Dialog box for executing a command list using a POSIX shell
+
+## execution
+```
+./di-exec.sh
+```
+
+## Listed commands
+Commands that should appear in the execution interface must be placed in the file:
+```
+$ ./config/options.json
+```
+Every command must contain 2 values:
+- caption: Text to be showed in the program interface
+- command: The command it self, if the command uses quotes use simple ones to avoid conflict with json syntax.
+
+```
+{
+  "options": [
+    {"caption":"cat", "command":"cat /etc/hosts"},
+  ]
+}
+```