Adding liquidity allows the contributor to earn 0.2% swapping fees from the pairs they've provided.
When you've provided liquidity, you will receive VXLLP tokens (Voxel X Network Liquidity Provider tokens) as proof of contribution.
For example, if a user deposited $VXL and $ETH into a pool they would receive VXL-ETH VXLLP tokens.
These tokens represent a proportional share of the pooled assets.