Create a bounty form and update contributions guidelines

### Bounty-Level

Useful

### Complexity

Low Complexity

### Bounty-Amount

5 ADA

### Bounty Bonus

5 ADA

### Increase increment

5 ADA

### Bounty Description

```text
We need a form to create bounties and a description to go with it
```


### Code of Conduct

- [X] I agree to follow this project's Code of Conduct