Fixed the selected tweets color according to theme.
Updated readme and implemented options tutorial v1
Revert "Updated readme and implemented options tutorial v1"

This reverts commit 75cb7bcd9805b7bba44b0e2ad2ae5646c4599d16.
Revert "Revert "Updated readme and implemented options tutorial v1""

This reverts commit ddf616df22d7a8d4e06bddde4a8b1a75be08fd47.