Created documentation for Seeed relay switches

Author: KoenBreeman

components/switch/images/Seeed-4-Channel-SPDT-Relay.png

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+.. _seeedmultichannelrelay_switch:
+
+Seeed Multi Channel Relay Switch Component
+==========================================
+
+.. seo::
+    :description: Instructions for setting up seeedmultichannelrelay Switch.
+
+The ``seeedmultichannelrelay`` switch platform supports the 8 channels of the relay unit. There are multi relays which are supported.
+The relays can be used to switch up to AC-250V or DC-110V. For more information: 
+
+Below are several links to supported relays
+https://wiki.seeedstudio.com/Grove-4-Channel_SPDT_Relay/
+
+https://wiki.seeedstudio.com/Grove-8-Channel_Solid_State_Relay/
+
+.. figure:: images/Seeed-4-Channel-SPDT-Relay.png
+    :align: center
+    :width: 80.0%
+
+.. figure:: images/Seeed-8-Channel-Solid-State-Relay.png
+    :align: center
+    :width: 80.0%
+
+.. code-block:: yaml
+
+    # Example configuration entry
+    seeedmultichannelrelay:
+        id: SeeedMultiChannelRelay_ID
+        change_address_to: 0x11 # changes the address of the seeedmultichannelrelay only runs this once
+        # ...
+
+    switch:
+      - platform: seeedmultichannelrelay
+        id: relay_1
+        name: relay1
+        channel: 1
+        seeedmultichannelrelay_id: SeeedMultiChannelRelay_ID
+
+Configuration variables:
+------------------------
+**Control**
+
+- **change_address_to** (*Optional*, hex-address): This should only be added to change the i2c address
+  on the EPROM of the relay. Afterwards the address will be permanently changed.
+
+- All other options from I2C devices.
+
+**Switch**
+
+- **channel** (*Required*, string): The channel number to switch, options are 1 to 8 (depending on the relay switch design).
+- **seeedmultichannelrelay_id** (*Optional*, :ref:`config-id`): The ID of the Seed relay.
+- **interlock** (*Optional*, list): A list of other switches in an interlock group. See
+  :ref:`switch-gpio-interlocking`.
+- **interlock_wait_time** (*Optional*, :ref:`config-time`): For interlocking mode, set how long
+  to wait after other items in an interlock group have been disabled before re-activating.
+  Useful for motors where immediately turning on in the other direction could cause problems.
+
+- All other options from :ref:`Switch <config-switch>`.
+
+This switch supports the same interlocking as the GPIO switch.
+
+See Also
+--------
+
+- :doc:`index`
+- :apiref:`seeedmultichannelrelay/switch/seeedmultichannelrelay_switch.h`
+- :apiref:`gpio/switch/gpio_switch.h`
+- :ghedit:`Edit`