docs: Desktop POC SDD (#1709)

docs/desktop/flank_desktop.md

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+# Flank desktop prototype
+
+## Prototype Flank options
+
+The prototype will run a simple Android test on a given apk and test the apk with options to specify some flanks flags, as well
+as max tests shards. Those flags are the most popular one based on [mixpanel analytics](https://mixpanel.com/report/2288623/view/2835119/dashboards#id=879189)
+
+- Flags
+  - disable sharding
+  - disable results upload
+  - fail fast 
+  - disable usage statistics 
+  - auto Google login
+
+- Input
+  - Max tests shards 
+  - apk path 
+  - test apk path
+
+## Prototype design
+
+The mockup of the design is shown below:  
+
+![mock](flank_mock.png)
+
+### Design elements
+
+- At the top left side there are some small buttons to toggle state of boolean options
+- Below there is text field to input `maxTestsShards`
+- Below there are two text fields with buttons placed at the right to open file chooser/provide a path to files
+- At the very bottom of left column there is a button to start Flank test run.
+- On the right side there is a big window which is responsible for displaying output
+
+## Setup
+
+Please follow [getting started guide](https://github.com/JetBrains/compose-jb/tree/master/tutorials/Getting_Started) to set up new module for a prototype.
+There is also a [gradle plugin](https://github.com/JetBrains/compose-jb/tree/master/gradle-plugins) for simplifying usage of Jetbrains compose.
+More info on [project page](https://github.com/JetBrains/compose-jb/).
+
+### Additional resources
+- [IntelliJ Idea plugin](https://github.com/JetBrains/compose-jb/tree/master/examples/intelliJPlugin)
+- [Tutorial](https://developer.android.com/jetpack/compose/layout)
+- [Latest build](https://developer.android.com/jetpack/compose/layout)
+- [Template to use without gradle](https://github.com/JetBrains/compose-jb/tree/master/templates)