docs: add roadmap to readme (lambdaclass#252)

README.md

@@ -132,6 +132,66 @@ Our aim is to infuse these strengths into the Ethereum consensus client ecosyste
 
 We also have for objective to bootstart an Ethereum Elixir community, and to make Elixir a first-class citizen in the Ethereum ecosystem.
 
+## Roadmap
+
+**1. Block Subscription - Mid September**
+   - Libp2p discovery and block retrieval
+   - SSZ + snappy
+   - `on_block` callback: Save the latest block in fork-choice store, conduct basic checks. GetHead returns the last obtained block.
+   - Beacon API: Return block root (`GET /beacon/states/{state_id}/root`)
+
+**2. Checkpoint Sync - October**
+   - Libp2p primitives for sync
+   - Support checkpoint Sync from a known provider
+   - Sync from the latest finalized block
+   - BeaconAPI: Return headers for head block
+   - EngineAPI: Validate incoming blocks
+
+**3. Attestations - Mid October**
+   - Libp2p attestation retrieval
+   - Basic beacon state representation
+   - Store attestations (last message sent by each validator)
+   - `on_attestation` callback for attestations sent via Gossip
+   - Process attestations from blocks
+   - Beacon API: Return head block root (`GET /beacon/states/head/root`)
+
+**4. Deposits - November**
+   - BLS signature checks
+   - Update consensus state view of deposit contract (`process_eth1_data`)
+   - Process deposit operation to update validator list (`process_deposit`)
+   - Verify block signatures (`verify_block_signature`)
+
+**5. Slots and Fork-choice - Mid November**
+   - `on_tick`/`process_slot` in state transition; a GenServer that calls this periodically
+   - `on_block`: Add slot-related checks and epoch calculations (excluding finalization)
+   - Get-head uses the messages
+   - Block header validation
+   - EngineAPI: Process execution payload
+   - BeaconAPI: Ensure getting head values point to the heaviest
+
+**6. Finality and Slashing - Mid November**
+   - Epoch processing
+   - `on_block`: Prune fork-choice store; reject blocks before finalization
+   - Add RANDAO mix to the beacon state
+   - BeaconAPI: Retrieve finality checkpoints, randao mixes
+   - Process attester slashings and proposer slashings
+   - EngineAPI: fork-choice updates
+
+**7. Rewards, Shuffling - December**
+   - Process rewards `on_epoch` for a checkpoint
+   - Handle Deposits and Withdrawals
+   - Implement RANDAO
+   - Calculate committee for a given state
+   - Conduct shuffling
+   - Integrate with Grafana
+   - BeaconAPI: Retrieve randao mix for a given block 
+
+**8. Validator Features - Mid December/January 2024**
+   - Create attestations
+   - Monitor for slashings
+   - Create slashing proofs
+   - BeaconAPI: Post blocks, slashings, voluntary exits, and withdrawals
+
 ## Contributor Package
 
 Dream of becoming an Ethereum core developer? Eager to shape the protocol that will underpin tomorrow's world? Want to collaborate with a passionate team, learn, grow, and be a pivotal part of the Ethereum Elixir community?