Added module: command-dispatcher, allows shell commands to be run

Ticket: CFE-4627

Signed-off-by: Simon Halvorsen <simon.halvorsen@northern.tech>

Author: SimonThalvorsen

management/command-dispatcher/README.md

@@ -0,0 +1,38 @@
+This module enables the running of shell commands based on input from the Mission-Portal's build page or `cfbs input`.
+
+Internally these commands are ran using the `"useshell"`-promise based on the `condition`-variable. 
+
+**Note:**
+
+---
+
+**Usage:**
+
+* `command` - The command to run.
+
+* `condition` - Condition for running. Use a class expression (e.g., `linux|bsd`). Defaults to `"any"`
+
+* `ifelapsed` - Number of minutes between assessments. Defaults to 5 minutes.
+
+E.g. 
+```json
+...
+{
+"command": "echo \"Hello World\"",
+"condition": "linux",
+"ifelapsed": "5"
+},
+...
+```
+Would echo "Hello world" on every linux device with 5 minute intervals.
+
+---
+
+## Contribute
+
+Feel free to open pull requests to expand this documentation, add features or fix problems.
+You can also pick up an existing task or file an issue in [our bug tracker](https://tracker.mender.io/issues/).
+
+## License
+
+This software is licensed under the MIT License. See LICENSE in the root of the repository for the full license text.