docs: add OSMD.Version docstring

src/OpenSheetMusicDisplay/OpenSheetMusicDisplay.ts

@@ -506,6 +506,7 @@ export class OpenSheetMusicDisplay {
     public get DrawingParameters(): DrawingParameters {
         return this.drawingParameters;
     }
+    /** Returns the version of OSMD this object is built from (the version you are using). */
     public get Version(): string {
         return this.version;
     }