feat(storage): new Local and WebSQL/SQLite key value storage service

ionic/storage/local-storage.ts

@@ -0,0 +1,37 @@
+import {StorageStrategy} from './storage';
+
+export class LocalStorage extends StorageStrategy {
+  constructor() {
+    super();
+  }
+  get(key) {
+    return new Promise((resolve, reject) => {
+      try {
+        let value = window.localStorage.getItem(key);
+        resolve(value);
+      } catch(e) {
+        reject(e);
+      }
+    });
+  }
+  set(key, value) {
+    return new Promise((resolve, reject) => {
+      try {
+        window.localStorage.setItem(key, value);
+        resolve();
+      } catch(e) {
+        reject(e);
+      }
+    });
+  }
+  remove(key) {
+    return new Promise((resolve, reject) => {
+      try {
+        window.localStorage.removeItem(key);
+        resolve();
+      } catch(e) {
+        reject(e);
+      }
+    });
+  }
+}