Crypto: Add conversion filter

Here a cool feature to add will be where we take in input money (some amount) and then as the user to choose one or a set of crypto-currencies. Then we can compute the new amount in a period of 24 hours so that the user know whether he/she would have gained or lost money. This should be in form of button -> pop-up new screen.

Screenshots: 
- Button and Placement
- pop - up screen