Created process.start (markdown)

process.start.md

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+### Request
+* **Description**: Instructs the supervisor daemon to start a registered process.
+* **Subscribers**: [ProcessHandler](https://github.com/avatao-content/baseimage-tutorial-framework/wiki/ProcessHandler)
+
+```json
+{
+    "key": "process.start",
+    "intent": "control",
+    "scope": "zmq"
+}
+```
+
+| Parameter    | Type     | Required           | Description                 |
+| ------------ |:--------:|:------------------:| --------------------------- |
+| *name* | `string` | :heavy_check_mark: | Name of the process. |
+
+***
+
+**Example**:
+```json
+{
+    "key": "process.start",
+    "name": "webservice"
+}
+```
+
+### Response
+* **Description**: Raises an event that contains an `error` field if the process exited with an error code, otherwise it's just the same as the original request.
+* **Subscribers**: *(none)*
+
+```json
+{
+    "key": "process.start",
+    "intent": "event",
+    "scope": "broadcast"
+}
+```
+
+| Parameter    | Type     | Required           | Description                 |
+| ------------ |:--------:|:------------------:| --------------------------- |
+| *name* | `string` | :heavy_check_mark: | Name of the current FSM state. |
+| *error* | `string` | | Error message of the supervisor daemon. |
+
+***
+
+**Example**:
+```json
+{
+    "key": "process.start",
+    "intent": "event",
+    "scope": "broadcast",
+    "name": "webservice",
+    "error": "SPAWN_ERROR: webservice..."
+}
+```