Add Building with AI documentation page (#2175)

* Add Building with AI documentation page

* fix: format building-with-ai.mdx with prettier

* Update docs/tools/developer-tools/building-with-ai.mdx

Co-authored-by: Elliot Voris <elliot@stellar.org>

---------

Co-authored-by: Elliot Voris <elliot@stellar.org>

Author: kaankacar

docs/tools/developer-tools/building-with-ai.mdx

@@ -0,0 +1,116 @@
+---
+title: Building with AI
+description: Use Stellar documentation with AI assistants and Large Language Models
+sidebar_label: Building with AI
+sidebar_position: 118
+---
+
+# Building with AI
+
+Stellar provides resources to help AI assistants and Large Language Models (LLMs) understand our documentation, making it easier for you to get accurate answers about Stellar development.
+
+## Using llms.txt
+
+[`llms.txt`](https://developers.stellar.org/llms.txt) is a standardized way to provide documentation context to AI systems. This file contains a structured overview of Stellar's developer documentation optimized for LLM consumption.
+
+When you ask an AI assistant about Stellar, it can reference this file to:
+
+- Understand the structure of our documentation
+- Find relevant pages for your questions
+- Provide more accurate, up-to-date answers
+
+## Using with AI assistants
+
+### ChatGPT, Claude, and other LLMs
+
+You can paste the contents of `llms.txt` into your conversation to give the AI context about Stellar:
+
+```
+Please read this documentation overview and help me with Stellar development:
+[paste contents of https://developers.stellar.org/llms.txt]
+```
+
+### AI-powered coding assistants
+
+Tools like GitHub Copilot, Cursor, Claude or Gemini can benefit from having `llms.txt` in your project context when working on Stellar-related code.
+
+#### Cursor
+
+You can provide Cursor with Stellar development context in two ways:
+
+**Option 1: Using Cursor Settings**
+
+1. Open **Cursor Settings** (the gear icon in the sidebar)
+2. Navigate to **Rules** (under the **Features** section)
+3. Click **Add Rule**
+4. Add your Stellar development guidelines and save
+
+**Option 2: Using a `.cursorrules` file**
+
+Create a `.cursorrules` file in your project root:
+
+```text title=".cursorrules"
+When developing on Stellar, refer to the official documentation at https://developers.stellar.org
+
+For comprehensive documentation context, fetch and reference: https://developers.stellar.org/llms.txt
+
+Key resources:
+- Smart Contracts: https://developers.stellar.org/docs/build/smart-contracts
+- Stellar CLI: https://developers.stellar.org/docs/tools/cli
+- SDKs: https://developers.stellar.org/docs/tools/sdks
+```
+
+The Settings approach applies rules globally across all projects, while `.cursorrules` files are project-specific.
+
+#### ChatGPT
+
+ChatGPT offers two ways to provide persistent context:
+
+- **Custom Instructions**: Go to Settings → Personalization → Custom Instructions to add information about yourself and how you'd like ChatGPT to respond. You can include that you're a Stellar developer and prefer references to official documentation.
+
+- **Custom GPTs**: Create a custom GPT with Stellar documentation context built in. You can configure it to reference `llms.txt` and provide specialized Stellar development assistance.
+
+#### Claude
+
+Claude provides context customization through:
+
+- **Projects**: Create a project and add custom instructions along with knowledge files. You can upload relevant documentation or add instructions to always reference the Stellar docs.
+
+- **Memory**: Claude can remember details from past conversations. You can ask Claude to remember that you're working on Stellar development, and it will retain this context across sessions.
+
+#### Gemini
+
+Google's Gemini offers context customization through:
+
+- **Gems**: Create custom Gems (specialized AI assistants) with specific instructions for Stellar development. Go to the Gems section in Gemini and create a new Gem with your Stellar context and guidelines.
+
+- **Saved Info**: In Gemini settings, you can add saved information about yourself, including that you're a Stellar developer, which Gemini will reference in future conversations.
+
+### Custom AI applications
+
+If you're building an AI application that answers questions about Stellar, you can fetch and include `llms.txt` in your prompt context:
+
+```javascript
+const response = await fetch("https://developers.stellar.org/llms.txt");
+const stellarContext = await response.text();
+
+// Include stellarContext in your LLM prompt
+```
+
+## Stella: Your Stellar AI Assistant
+
+In addition to `llms.txt`, Stellar provides [Stella](https://developers.stellar.org/docs/tools/developer-tools/ai-bot), an AI assistant specifically trained on Stellar documentation, code examples, and community knowledge.
+
+Stella can help you with:
+
+- Smart contract development questions
+- Understanding Stellar concepts
+- Debugging and troubleshooting
+- Finding relevant documentation
+
+You can chat with Stella right here by clicking the yellow icon at the bottom of this page, or join the `#stella-help` channel in the [Stellar Developer Discord](https://discord.gg/stellardev).
+
+## Additional resources
+
+- [Stella AI Bot](https://developers.stellar.org/docs/tools/developer-tools/ai-bot) - Stellar's built-in AI assistant
+- [Stellar Developer Discord](https://discord.gg/stellardev) - Ask questions in #stella-help

routes.txt

@@ -743,6 +743,7 @@
 /docs/tools/developer-tools/anchor-tools
 /docs/tools/developer-tools/asset-tools
 /docs/tools/developer-tools/block-explorers
+/docs/tools/developer-tools/building-with-ai
 /docs/tools/developer-tools/jupyter-notebooks
 /docs/tools/developer-tools/network-insights
 /docs/tools/developer-tools/network-status