added infrared to wiki and ir remote to android

wiki/android/ir_remote.md

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+# IR Remote
+
+[IR Remote](https://gitlab.com/divested-mobile/irremote) is a free and open-source App developed
+for [Android](/wiki/android.md) systems.
+It can use a [smartphone](/wiki/smart_devices.md#smartphones-and-tablet-computers) that is capable
+of sending [infrared](/wiki/infrared.md) signals to be used as an
+[infrared remote control](/wiki/infrared.md#remote-controls)
+
+## Setup
+
+On [Android](/wiki/android.md) IR Remote is available on the
+[F-Droid app store](/wiki/android/f-droid.md) in a package called
+[IR Remote](https://f-droid.org/de/packages/us.spotco.ir_remote/).
+
+## Usage
+
+IR Remote features many preset remote controls for devices of major brands.
+For devices not included in these presets the infrared codes can be searched on the web.
+The [infrared article](/wiki/infrared.md) features a
+[list of available resources](/wiki/infrared.md#remote-controls).

wiki/infrared.md

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+# Infrared
+
+Infrared - short IR - is electromagnetic radiation that is used in many technical applications.
+
+## Remote Controls
+
+Many remote controls use infrared.
+A simple explanation for the widely used pronto format was explained in an
+[article by hifi-remote](http://www.hifi-remote.com/infrared/IR-PWM.shtml).
+A more technical explanation of the signals of different formats can be found in an
+[article by vishay](https://www.vishay.com/docs/80071/dataform.pdf).
+
+Devices by different vendors usually use different codes.
+There are different databases.
+The following is a list of resources.
+
+- [JP1 Forum](https://www.getzweb.net/jp1/) is a community that shares files for different devices.
+  Some like the
+  [Dyson codes](http://www.hifi-remote.com/forums/viewtopic.php?t=101540&sid=807339ebbff2ee3938d6d3784cecd24e)
+  are a bit more hidden in forum posts.
+- [Remote Central](https://www.remotecentral.com/cgi-bin/codes/) also has a huge database.
+- [ghartwells SMSL repository](https://github.com/ghartwell/SMSL/tree/master) features many SMSL
+  IR codes.
+- [RCoid](https://www.rcoid.de/remotefiles.html) features some ready made rcf files.
+  Despite this format they can be opened with a text editor and searched for codes by hand.