Add type definition for leaflet-deepzoom (#36355)

https://github.com/alfarisi/leaflet-deepzoom/

types/leaflet-deepzoom/index.d.ts

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+// Type definitions for leaflet-deepzoom 2.0
+// Project: https://github.com/alfarisi/leaflet-deepzoom/
+// Definitions by: Håkon Løvdal <https://github.com/hlovdal>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import * as L from 'leaflet';
+
+declare module 'leaflet' {
+    namespace TileLayer {
+        interface DeepZoomOptions {
+            width?: number;
+            height?: number;
+            imageFormat?: string;
+            tileSize?: number;
+            maxZoom?: number;
+        }
+
+        class DeepZoom extends TileLayer {
+            constructor(urlTemplate: string, options?: DeepZoomOptions);
+            // getTileUrl(tilePoint: Coords): string;
+        }
+    }
+
+    namespace tileLayer {
+        function deepzoom(urlTemplate: string, options?: TileLayer.DeepZoomOptions): TileLayer.DeepZoom;
+    }
+}

types/leaflet-deepzoom/leaflet-deepzoom-tests.ts

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+import * as L from 'leaflet';
+import 'leaflet-deepzoom';
+
+const map = L.map('image2d').setView(new L.LatLng(0, 0), 0);
+const dzLayer = L.tileLayer.deepzoom('DeepZoomImage/hubble_files/', {
+    width: 2400,
+    height: 3000,
+}).addTo(map);

types/leaflet-deepzoom/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "leaflet-deepzoom-tests.ts"
+    ]
+}

types/leaflet-deepzoom/tslint.json

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+{ "extends": "dtslint/dt.json" }