docs: Add System Card and link in README

README.md

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+## 📜 System Card & Methodology
+For a detailed technical breakdown of the system architecture, RAG implementation, and ethical considerations, please see the [**System Card**](SYSTEM_CARD.md).
+
 ---
 
 ## 👤 Author

SYSTEM_CARD.md

@@ -0,0 +1,74 @@
+---
+title: "Building the PNA Assistant: A Nurse's Guide to AI Resilience Tools"
+authors:
+  - user: NurseCitizenDeveloper
+    guest: true
+tags:
+  - nlp
+  - healthcare
+  - gemma
+  - rag
+  - ethical-ai
+  - system-card
+---
+
+# Building the PNA Assistant: A Nurse's Guide to AI Resilience Tools
+
+**"AI isn't here to replace nurses. It's here to be built by us."**
+
+The resilience of the nursing workforce is a global priority. In the UK, the **Professional Nurse Advocate (PNA)** role has been a game-changer, using the **A-EQUIP model** to provide restorative clinical supervision. But with staffing pressures, accessing a trained PNA when you need one most can be a challenge.
+
+What if we could build a tool to bridge that gap? Not to replace the human supervisor, but to provide a safe, 24/7 space for reflection?
+
+Enter the **PNA Assistant**—an open-source AI research tool built by a nurse, for nurses.
+
+## 🏥 What is the PNA Assistant?
+
+The [PNA Assistant](https://huggingface.co/spaces/NurseCitizenDeveloper/PNA-Assistant) is a specialized AI agent designed to simulate the "Restorative Clinical Supervision" function of a Professional Nurse Advocate. 
+
+Unlike generic chatbots, it doesn't just "chat." It is grounded in the **A-EQUIP Model** (Advocating for Educating for Quality Improvement and Practice) and strictly adheres to the official NHS PNA Handbook.
+
+### Key Capabilities
+*   **Restorative Dialogue**: Asking reflective questions to help nurses process emotional challenges.
+*   **Policy Grounding**: Retrieving exact guidance from the A-EQUIP framework (Normative, Formative, and Restorative).
+*   **Safety First**: Hard-coded safety rails to distinguish educational support from clinical/crisis intervention.
+
+---
+
+## ⚙️ Under the Hood: The "Nurse Citizen Developer" Stack
+
+We built this tool using a **Retrieval-Augmented Generation (RAG)** architecture, hosted entirely on Hugging Face Spaces using ZeroGPU.
+
+### 1. The Brain: Gemma 2 2B IT 🧠
+We chose Google's **Gemma 2 2B IT** (Instruction Tuned) as our foundation. Why?
+*   **Efficient**: It runs fast on renewable cloud resources.
+*   **Capable**: It has excellent reasoning capabilities for its size.
+*   **Open**: It aligns with our philosophy of open healthcare research.
+
+### 2. The Knowledge: RAG 📚
+To prevent hallucinations (AI making things up), we don't rely solely on the model's training data. Instead, we use RAG:
+1.  **Knowledge Base**: We embedded the *PNA Handbook* and *A-EQUIP Guidance*.
+2.  **Retrieval**: When you ask a question, the system searches these documents for the answer.
+3.  **Generation**: The AI uses that official text to construct its response.
+
+### 3. The Persona: "Compassionate Instruction Tuning" ❤️
+The "secret sauce" is the System Prompt. We didn't just tell it to be helpful; we told it to be a **Nurse**.
+*   *Legacy Challenge*: AI can sound robotic or overly solution-focused.
+*   *Our Solution*: We instructed the model to prioritize **Validation** and **Reflection** over immediate problem-solving, mirroring the core skills of a PNA.
+
+---
+
+## 🚀 Why "Citizen Development" Matters
+
+This project proves that you don't need a Computer Science degree to build impactful health AI. You need clinical expertise and curiosity.
+
+By taking ownership of the technology, we ensured that **Nursing Values**—compassion, safety, and advocacy—were baked into the code from Day 1. This isn't just an AI tool; it's a statement that nurses are ready to lead in the digital era.
+
+## 🎓 Research & Availability
+
+The PNA Assistant is available today as a **Research Artifact**. We invite nursing researchers, educators, and digital health innovators to test it, break it, and build upon it.
+
+*   **Try the Model**: [Hugging Face Space](https://huggingface.co/spaces/NurseCitizenDeveloper/PNA-Assistant)
+*   **Read the Code**: [GitHub Repository](https://github.com/ClinyQAi/Professional-Nurse-Advocate-Assistant)
+
+*Disclaimer: This tool is for educational and research simulation purposes only. It does not provide clinical diagnosis or crisis mental health support.*