[WDF] Add Windows Driver Framework files

Takern from Microsoft GitHub repo:
d9c6040fe9

Licensed under MIT

sdk/lib/drivers/wdf/shared/inc/primitives/common/mxfileobject.h

@@ -0,0 +1,97 @@
+/*++
+
+Copyright (c) Microsoft Corporation
+
+ModuleName:
+
+    MxFileObject.h
+
+Abstract:
+
+    Mode agnostic definition of File Object
+
+    See MxFileObjectKm.h and MxFileObjectUm.h/cpp for mode
+    specific implementations
+
+--*/
+
+#pragma once
+
+class MxFileObject
+{
+private:
+    MdFileObject m_FileObject;
+
+public:
+    __inline
+    MxFileObject(
+        _In_ MdFileObject FileObject
+        ) :
+        m_FileObject(FileObject)
+    {
+    }
+
+    __inline
+    VOID
+    SetFileObject(
+        _In_ MdFileObject FileObject
+        )
+    {
+        m_FileObject = FileObject;
+    }
+
+    __inline
+    MdFileObject
+    GetFileObject(
+        VOID
+        )
+    {
+        return m_FileObject;
+    }
+
+    __inline
+    MxFileObject(
+        VOID
+        ) :
+        m_FileObject(NULL)
+    {
+    }
+
+    PUNICODE_STRING
+    GetFileName(
+        _Inout_opt_ PUNICODE_STRING Filename
+        );
+
+    PLARGE_INTEGER
+    GetCurrentByteOffset(
+        VOID
+        );
+
+    ULONG
+    GetFlags(
+        VOID
+        );
+
+    VOID
+    SetFsContext(
+        _In_ PVOID Value
+        );
+
+    VOID
+    SetFsContext2(
+        _In_ PVOID Value
+        );
+
+    PVOID
+    GetFsContext(
+        VOID
+        );
+
+    PVOID
+    GetFsContext2(
+        VOID
+        );
+
+};
+
+