Import ideas and known issues

KNOWN_ISSUES.md

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+# ExectOS Known Issues
+This is a list of well known bugs that exists in all master branch builds.
+
+## XTLDR
+[ ] In some specific scenarios (most probably EFI by Insyde) XTLDR cannot load modules. Calling BootServices->LoadImage()
+    fails with STATUS_EFI_NOT_FOUND status code. Possibly this is a bug in BlFindVolumeDevicePath() routine.
+[ ] EFI Runtime Services are not mapped properly into higher half. They are mapped itself, but all pointers inside that
+    structure point to some physical address that is unavailable after paging is enabled.