Add Osmosis example

Author: kruspy

pages/en/supported-networks/cosmos.mdx

@@ -236,3 +236,5 @@ Here are some example subgraphs for reference:
 [Validator Rewards Example](https://github.com/graphprotocol/example-subgraph/tree/cosmos-validator-rewards)
 
 [Validator Delegations Example](https://github.com/graphprotocol/example-subgraph/tree/cosmos-validator-delegations)
+
+[Osmosis Token Swaps Example](https://github.com/graphprotocol/example-subgraph/tree/osmosis-token-swaps)