readme: add more consensus clients (#399)

Adding more consensus clients that we *should* support. 

category: docs
ticket: #148

README.md

@@ -58,12 +58,14 @@ and the beacon node via the official [Eth Beacon Node REST API](https://ethereum
 Charon supports any upstream beacon node that serves the Beacon API.
 Charon supports any downstream standalone validator client that consumes the Beacon API.
 
-|Client| Beacon Node | Validator Client  | Notes                                   |
-|-----|---------------|----------------|-----------------------------------------|
-|*Teku*| ✅ |   ✅   | Fully supported                         |
-|*Lighthouse*| ✅  |✅  | Fully supported                         |
-|*Prysm*| ✅ | 🛑 | Validator client requires gRPC API      |
-|*Nimbus*| ✅| 🛑 | No standalone validator client provided |
+| Client                                            | Beacon Node | Validator Client | Notes                                   |
+|---------------------------------------------------|-------------|------------------|-----------------------------------------|
+| [Teku](https://github.com/ConsenSys/teku)         | ✅           | ✅                | Fully supported                         |
+| [Lighthouse](https://github.com/sigp/lighthouse)  | ✅           | ✅                | Fully supported                         |
+| [Lodestar](https://github.com/ChainSafe/lodestar) | ✅           | ✅                | Fully supported                         |
+| [Vouch](https://github.com/attestantio/vouch)     | *️⃣         | ✅                | Only validator client provided          |
+| [Prysm](https://github.com/prysmaticlabs/prysm)   | ✅           | 🛑               | Validator client requires gRPC API      |
+| [Nimbus](https://github.com/status-im/nimbus-eth2) | ✅           | *️⃣              | No standalone validator client provided |
 
 ## Project Status