Added Transaction items with different types

Frontend/app/build.gradle

.../example/mobileapp/Recycler_View_Adapter_Transaction.java

...ava/com/example/mobileapp/Recycler_View_Adapter_User.java

.../app/src/main/java/com/example/mobileapp/Single_Trip.java

.../main/java/com/example/mobileapp/TransactionFragment.java

Frontend/app/src/main/res/drawable-anydpi/get_symbol.xml

Frontend/app/src/main/res/drawable-hdpi/get_symbol.png

Frontend/app/src/main/res/drawable-mdpi/get_symbol.png

Frontend/app/src/main/res/drawable-xhdpi/get_symbol.png

Frontend/app/src/main/res/drawable-xxhdpi/get_symbol.png

Frontend/app/src/main/res/drawable-xxxhdpi/get_symbol.png

Frontend/app/src/main/res/drawable/give_symbol.xml

Frontend/app/src/main/res/layout/layout_transaction.xml

...nd/app/src/main/res/layout/layout_transaction_receive.xml

Frontend/app/src/main/res/layout/layout_user_group.xml

Frontend/app/src/main/res/layout/single_trip.xml

Images/+.png

Images/drawable-hdpi/+.png

Images/drawable-ldpi/+.png

Images/drawable-mdpi/+.png