[ADDED] Documentation links for future reference

Author: hossain-khan

app/src/main/res/values-land/dimens.xml

@@ -14,6 +14,14 @@
   ~ limitations under the License.
   -->
 
+<!--
+    Support different screen sizes.
+
+    For reference see:
+      - https://material.io/tools/devices/
+      - https://developer.android.com/guide/topics/resources/providing-resources
+      - https://developer.android.com/training/multiscreen/screensizes
+-->
 <resources>
     <!-- On phone use more column on landscape mode for better content browsing -->
     <item name="grid_column_count" type="integer">2</item>

app/src/main/res/values-sw760dp-land/dimens.xml

@@ -14,6 +14,14 @@
   ~ limitations under the License.
   -->
 
+<!--
+    Support different screen sizes.
+
+    For reference see:
+      - https://material.io/tools/devices/
+      - https://developer.android.com/guide/topics/resources/providing-resources
+      - https://developer.android.com/training/multiscreen/screensizes
+-->
 <resources>
     <!-- On large tablet use even more column on landscape mode for better content browsing -->
     <item name="grid_column_count" type="integer">3</item>

app/src/main/res/values-sw760dp/dimens.xml

@@ -14,6 +14,14 @@
   ~ limitations under the License.
   -->
 
+<!--
+    Support different screen sizes.
+
+    For reference see:
+      - https://material.io/tools/devices/
+      - https://developer.android.com/guide/topics/resources/providing-resources
+      - https://developer.android.com/training/multiscreen/screensizes
+-->
 <resources>
     <!-- On large tablet use more column on portrait mode for better content browsing -->
     <item name="grid_column_count" type="integer">2</item>

app/src/main/res/values/dimens.xml

@@ -16,6 +16,14 @@
   ~ limitations under the License.
   -->
 
+<!--
+    Support different screen sizes.
+
+    For reference see:
+      - https://material.io/tools/devices/
+      - https://developer.android.com/guide/topics/resources/providing-resources
+      - https://developer.android.com/training/multiscreen/screensizes
+-->
 <resources>
     <dimen name="box_size_small">40dp</dimen>
     <dimen name="box_size_medium">80dp</dimen>