[PT Run][New Plugin] Unit Converter (#9800) (#11406)

doc/devdocs/modules/launcher/plugins/community.unitconverter.md

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+# Unit Converter Plugin
+The Unit Convert plugin as the name suggests is used to perform unit conversion on the user entered query.
+This plugin uses a package called [UnitsNet](https://github.com/angularsen/UnitsNet).
+
+![Image of Calculator plugin](/doc/images/launcher/plugins/community.unitconverter.png)
+
+### Currently Supported Units
+ - [Acceleration](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/AccelerationUnit.g.cs)
+ - [Angle](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/AngleUnit.g.cs)
+ - [Area](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/AreaUnit.g.cs)
+ - [Duration](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/DurationUnit.g.cs)
+ - [Energy](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/EnergyUnit.g.cs)
+ - [Information](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/InformationUnit.g.cs)
+ - [Length](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/LengthUnit.g.cs)
+ - [Mass](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/MassUnit.g.cs)
+ - [Power](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/PowerUnit.g.cs)
+ - [Pressure](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/PressureUnit.g.cs)
+ - [Speed](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/SpeedUnit.g.cs)
+ - [Temperature](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/TemperatureUnit.g.cs)
+ - [Volume](https://github.com/angularsen/UnitsNet/blob/master/UnitsNet/GeneratedCode/Units/VolumeUnit.g.cs)
+
+ These are the ones that are currently enabled (though UnitsNet supports many more). They are defined in [`Main.cs`](/src/modules/launcher/Plugins/Community.PowerToys.Run.UnitConverter/Main.cs).
+
+
+### [`InputInterpreter`](/src/modules/launcher/Plugins/Community.PowerToys.Run.UnitConverter/InputInterpreter.cs)
+ - Class which manipulates user input such that it may be interpreted correctly and thus converted.
+ - Uses a regex amongst other things to do this.
+
+### [`UnitHandler`](/src/modules/launcher/Plugins/Community.PowerToys.Run.UnitConverter/UnitHandler.cs)
+ - Class that does the actual conversion.
+ - Supports abbreviations in user input (single, double, or none).