add learn page for abci execution

Author: pthmas

learn/execution/abci.md

@@ -0,0 +1,29 @@
+# ABCI-Compatible Execution Layers in Rollkit
+
+Rollkit is designed to be modular and flexible, allowing different execution layers to be plugged in via the ABCI (Application Blockchain Interface) protocol. This means you can use a variety of ABCI-compatible applications as the execution environment for your rollup.
+
+## Supported Execution Layers
+
+### Cosmos SDK App
+A Cosmos SDK-based application can serve as the execution layer for a Rollkit rollup. This allows you to leverage the rich ecosystem and features of the Cosmos SDK, including modules for staking, governance, IBC, and more.
+
+- [Cosmos SDK Documentation](https://docs.cosmos.network/)
+
+### CosmWasm
+CosmWasm is a smart contract platform built for the Cosmos ecosystem. It is ABCI-compatible and can be integrated as the execution layer in Rollkit, enabling your rollup to support WebAssembly (Wasm) smart contracts.
+
+- [CosmWasm Documentation](https://docs.cosmwasm.com/)
+
+## How It Works
+
+- Rollkit acts as the consensus and data availability layer.
+- The execution layer (Cosmos SDK app or CosmWasm) processes transactions and maintains application state.
+- Communication between Rollkit and the execution layer happens via the ABCI protocol.
+
+## Benefits
+
+- **Modularity:** Choose the execution environment that best fits your use case.
+- **Interoperability:** Leverage existing Cosmos SDK modules or deploy CosmWasm smart contracts.
+- **Extensibility:** Easily upgrade or swap out the execution layer as your rollup evolves.
+
+For more details on integrating an execution layer with Rollkit, see the respective documentation links above.