[Preparing fir issue #1773] Added a utility function which would take…

… the user to app settings screen where he could manually give us the required permission

app/src/main/java/fr/free/nrw/commons/utils/PermissionUtils.java

@@ -0,0 +1,19 @@
+package fr.free.nrw.commons.utils;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.net.Uri;
+import android.provider.Settings;
+
+public class PermissionUtils {
+
+    //Can be used by any activity which requires a permission which has been blocked(marked never ask again by the user)
+    //It open the app settings from where the user can manully give us the required permission.
+    public static void askUserToManuallyEnablePermissionFromSettings(
+            Activity activity) {
+        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
+        Uri uri = Uri.fromParts("package", activity.getPackageName(), null);
+        intent.setData(uri);
+        activity.startActivityForResult(intent, Constants.REQUEST_CODES.OPEN_APPLICATION_DETAIL_SETTINGS);
+    }
+}