ADD: added APP-6 Symbols to the Map

node_modules/milsymbol/test/app6b-subsurface.test.js

@@ -0,0 +1,11 @@
+import { ms } from "../src/milsymbol";
+ms.reset();
+
+import { app6b } from "stanag-app6";
+import verify from "./letter-sidc";
+ms.setStandard("APP6");
+
+import { subsurface } from "../src/lettersidc";
+ms.addIcons(subsurface);
+
+export default verify(ms, "APP-6 B Sub Surface", app6b.WAR.SBSUF);