Update README.md

Author: zhukic

README.md

@@ -28,54 +28,10 @@ public boolean onPlaceSubheaderBetweenItems(int position) {
 }
 ```
 # Sample
-Please try out [sample app](https://github.com/zhukic/Sectioned-RecyclerView/tree/master/sample) for more details.
+Please try out [sample app](https://github.com/zhukic/Sectioned-RecyclerView/tree/master/sample) for more details. Or:
 
-# Modify data
-```java
-
-notifyDataChanged();
-
-notifyItemInsertedAtPosition(int);
-
-notifyItemChangedAtPosition(int);
-
-notifyItemRemovedAtPosition(int);
-
-```
-# Expanding and Collapsing Sections
-```java
-
-expandSection(int sectionIndex);
-
-expandAllSections();
-
-collapseSection(int sectionIndex);
-
-collapseAllSections();
-
-isSectionExpanded(int sectionIndex);
+[<img src="https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png" width="323" height="125">](https://play.google.com/store/apps/details?id=com.github.zhukic.sectionedrecyclerview)
 
-```
-# Other methods
-```java
-
-boolean isSubheaderAtPosition(int adapterPosition);
-
-int getSectionIndex(int adapterPosition);
-
-int getItemPositionInSection(int adapterPosition);
-
-boolean isFirstItemInSection(int adapterPosition);
-
-boolean isLastItemInSection(int adapterPosition);
-
-int getSectionSize(int sectionIndex);
-
-int getSectionSubheaderPosition(int sectionIndex);
-
-int getSectionsCount();
-
-```
 # Grid
 If you are using a ```GridLayoutManager``` set it to adapter.
 ```java