added index.d.ts with missing ts declarations for used ol5 classes

Author: annarieger

index.d.ts

@@ -1,2 +1,13 @@
 declare module 'geostyler-openlayers-parser';
 declare module '@terrestris/ol-util/dist/MapUtil/MapUtil';
+
+declare module 'ol/Feature';
+declare module 'ol/geom/Point';
+declare module 'ol/style/Circle';
+declare module 'ol/style/Fill';
+declare module 'ol/style/Icon';
+declare module 'ol/style/Image';
+declare module 'ol/style/RegularShape';
+declare module 'ol/style/Stroke';
+declare module 'ol/style/Style';
+declare module 'ol/style/Text';