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

management/command-dispatcher/README.md

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+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:**
+The commands are dispatched with root-privilege (uid=0) and a timeout-window of 300 seconds.
+
+---
+
+**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.