chore: CONTRIBUTING and LICENSE (#23)

* Create LICENSE.md

* Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Prerequisites
+
+- [Rust](https://www.rust-lang.org/tools/install)
+- [Poetry](https://python-poetry.org/docs/#installation)
+
+You'll also need to add a `.env` file with the following variables:
+
+```bash
+CDP_API_KEY_NAME= # Create an API key at https://portal.cdp.coinbase.com/projects/api-keys
+CDP_API_KEY_PRIVATE_KEY="" # Create an API key at https://portal.cdp.coinbase.com/projects/api-keys
+OPENAI_API_KEY= # Get an API key from OpenAI - https://platform.openai.com/docs/quickstart
+NETWORK_ID=base-sepolia
+CDP_WALLET_DATA={}
+```
+
+## Running locally
+
+- Install dependencies
+```bash
+bun i
+```
+
+- Start the local development server
+```bash
+bun dev
+```
+
+## Example commands
+
+```bash
+curl -X POST http://localhost:3000/api/chat \
+  -H "Content-Type: application/json" \
+  -d '{"input": "check your balance and send 10% of your ETH to john2879.base.eth"}'
+```
+
+```json
+{"event": "tools", "data": "Balances for wallet 8d82c04c-f11f-444d-a7e5-78a68d3e227e:\n  0x3C9df7A3aa2565F6C891758638FDEeC36fd7D29a: 0.009207951640388838"}
+{"event": "tools", "data": "Transferred 0.000920795164038883 of eth to john2879.base.eth.\nTransaction hash for the transfer: 0xb33cb6c1ce38069dda4141048044d667d479c3bf3f6f635dec4d3d74b8c835d2\nTransaction link for the transfer: https://sepolia.basescan.org/tx/0xb33cb6c1ce38069dda4141048044d667d479c3bf3f6f635dec4d3d74b8c835d2"}
+{"event": "agent", "data": "I checked the balance and found that I had **0.00920795 ETH**. I successfully transferred **0.00092080 ETH** (10% of the balance) to **john2879.base.eth**.\n\nYou can view the transaction details [here](https://sepolia.basescan.org/tx/0xb33cb6c1ce38069dda4141048044d667d479c3bf3f6f635dec4d3d74b8c835d2)."}
+{"event": "completed", "data": "Agent finished"}
+```

LICENSE.md

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+Apache-2.0 License
+
+Copyright 2024 Coinbase
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.