first pass implementing mnemonic phrase wallet import example

cdp-langchain/examples/wallet/.eslintrc.json

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+{
+  "parser": "@typescript-eslint/parser",
+  "extends": ["../../../.eslintrc.base.json"]
+}

cdp-langchain/examples/wallet/.prettierignore

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+docs/
+dist/
+coverage/
+.github/
+src/client
+**/**/*.json
+*.md 

cdp-langchain/examples/wallet/.prettierrc

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+{
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": false,
+  "trailingComma": "all",
+  "bracketSpacing": true,
+  "arrowParens": "avoid",
+  "printWidth": 100,
+  "proseWrap": "never"
+}

cdp-langchain/examples/wallet/README.md

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+# CDP AgentKit Langchain Extension Examples - Mnemomic Phrase Wallet Import
+
+This example demonstrates agentkit setup with an imported wallet from a mnemomic phrase through the ENV. An example of a mnemomic phrase could be:
+```bash
+eternal phone creek robot disorder climb thought eternal noodle flat cage bubble liquid sting can
+```
+
+## Requirements
+
+- Node.js 18+
+- [CDP API Key](https://portal.cdp.coinbase.com/access/api)
+
+### Checking Node Version
+
+Before using the example, ensure that you have the correct version of Node.js installed. The example requires Node.js 18 or higher. You can check your Node version by running:
+
+```bash
+node --version
+npm --version
+```
+
+## Installation
+
+```bash
+npm install
+```
+
+## Run the Chatbot
+
+### Set ENV Vars
+
+Ensure the following ENV Vars are set in .env
+- "CDP_API_KEY_NAME"
+- "CDP_API_KEY_PRIVATE_KEY"
+- "MNEMONIC_PHRASE"
+
+The mnemomic phrase example above can be used to validate wallet import functionality.
+
+```bash
+npm start
+```
+
+## License
+
+Apache-2.0