Adding new Plugin SIO Reaction (#1277)

* Adding new Plugin SOIReaction (Sub-Plugin for SIO Control)  to the repository.

* Corrected the date as pointed out in commens on MR

_plugins/SIOReaction.md

@@ -0,0 +1,97 @@
+---
+layout: plugin
+id: SIOReaction
+title: SIO Reaction
+description: Sub Plugin for SIO Control. Create Reactions to changes in IO, GCode, and more.
+
+authors: 
+- jcassel
+license: AGPLv3
+date: 2024-02-11
+homepage: https://github.com/jcassel/OctoPrint-SIOReaction
+source: https://github.com/jcassel/OctoPrint-SIOReaction
+archive: https://github.com/jcassel/OctoPrint-SIOReaction/archive/main.zip
+
+tags:
+- SIOControl SubPlugin
+- sio
+- gpio
+- rpio
+- pc
+- linux
+- gpiostatus
+- pin
+- pins
+- atx
+- control
+- io
+- power
+- estop
+- subplugin
+- gpiocontrol
+- relay
+- enclosure
+- button
+- filament
+- usb
+- serial
+- rs232
+- led
+- windows
+
+
+screenshots:
+- url: /assets/img/plugins/SIOReaction/SettingsExample.png
+  alt: SIO Reaction Settings
+  caption: SIO Reaction Settings 
+- url: /assets/img/plugins/SIOReaction/HelpScrn.png
+  alt: SIO Reaction Settings
+  caption: SIO Reaction Settings 
+
+
+featuredimage: /assets/img/plugins/SIOReaction/SettingsExample.png
+
+compatibility:
+  python: ">=3,<4"
+
+---
+
+#### The Companion plugIn for the SIO Control 
+
+A simple but powerful addition to the SIO Control PlugIn. With this Sub PlugIn you can make full use of inputs and outputs available though SIO Control PlugIn + hardware. 
+
+Reactions are what happen when an IO point changes. What should happen is up to you. 
+
+Do things like:
+- Use a physical button to tell your machine to home or start to heat up for the print you will be sending soon. 
+- Push a physical button and have a connected relay turn on, off or toggle state.  
+- Push a physical button and send GCode to the OctoPrint GCode queue.  
+- Have a relay turn on when specific GCode is seen. 
+- If a limit switch is hit, send some GCode to the GCode queue. 
+
+
+## Install
+
+Install via the bundled [Plugin Manager](https://docs.octoprint.org/en/master/bundledplugins/pluginmanager.html)
+or manually using this URL:
+
+    https://github.com/jcassel/OctoPrint-SIOReaction/archive/main.zip
+
+You must have the [SIO Control PlugIn](https://plugins.octoprint.org/plugins/siocontrol/) installed for this to work.
+
+## Configuration / Setup
+
+Setting up a Reaction is simple. Follow these steps.
+
+- Add a new Reaction row to the settings dialog. Push the Blue [+] button.
+- Name your Reaction. 
+- Select the configured SIO point to react to (ignored for GCode Command Reaction types).
+- Select the type of Reaction __React To__ 
+    - __NONE__ Effectivly disables the Reaction 
+    - __In Change__ React when this IO Input point changes state
+    - __In Active__ React when this IO Input point changes from Not Active to Active
+    - __In Not Active__ React when this IO Input point Changes from Active to Not Active
+    - __Out Change__ React when this IO Output point changes state
+    - __Out Active__ React when this IO Output point changes from Not Active to Active
+    - __Out Not Active__ React when this IO Output point changes from Active to Not Active
+    - __GCode Command__ React when a specific GCode command is detected.