Unreal: launching on Linux

openpype/hosts/unreal/README.md

@@ -0,0 +1,9 @@
+## Unreal Integration
+
+Supported Unreal Engine version is 4.26+ (mainly because of major Python changes done there).
+
+### Project naming
+Unreal doesn't support project names starting with non-alphabetic character. So names like `123_myProject` are
+invalid. If OpenPype detects such name it automatically prepends letter **P** to make it valid name, so `123_myProject`
+will become `P123_myProject`. There is also soft-limit on project name length to be shorter than 20 characters.
+Longer names will issue warning in Unreal Editor that there might be possible side effects.