Add readme

Author: Scavanger

INAV-SIM-OSD.csproj

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     </None>
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="img\" />
+  </ItemGroup>
+
 </Project>

img/INAV-SIM-OSD.png

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+# INAV SIM OSD
+
+PC OSD for INAV SITL/HITL
+
+![INAV-Sim-OSD](img/INAV-SIM-OSD.png)
+
+You may need to install the .NET Desktop Runtime 6 (latest version): https://dotnet.microsoft.com/en-us/download/dotnet/6.0
+
+## SITL:
+Configure a MSP-Displayport on any UART and connect via TCP to localhost (127.0.0.1) and the corresponding TCP port.
+See INAV SITL documentaion for more details.
+
+## HITL:
+Configure a MSP-Displayport on any UART and connect via UART to USB module and select corresponding COM-Port.
+
+## Font:
+The HD fonts from DJI WTFOS are used. New or updated fonts can simply be placed in a new subfolder in "osd-font".
+
+# Supported Simulators:
+- RealFlight
+- XPlane
+
+# Known issues:
+- Works only if simulator is in window mode (No fullscreen)
+- OSD stick menu isn't working (will be fixed soon)