docs: add blog post explaining project purpose

BLOG_POST.md

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+# Elder Care Copilot: Organizing the Chaos of Caregiving Paperwork
+
+## Why We Built It
+Caring for an elderly family member is an act of deep love, but it often comes with an overwhelming administrative burden. Medical bills, insurance explanations of benefits (EOBs), legal letters, and prescription updates pile up quickly. Caregivers frequently experience burnout just trying to figure out what needs immediate attention and what can be filed away. We realized there was a critical need for a tool that could organize this chaos while strictly protecting the privacy of sensitive health and financial data.
+
+## What It Does
+Elder Care Copilot is an offline, AI-powered document assistant designed specifically for caregiving paperwork. By uploading PDFs, images, or text files, the system uses local Optical Character Recognition (OCR) and an embedded Large Language Model (LLM) to instantly process the information. It triages documents by urgency (e.g., 🔴 URGENT vs. 🟢 FYI), extracts a concise summary, identifies deadlines, and allows the caregiver to ask specific questions about the document's contents.
+
+## What's Its Purpose
+The ultimate purpose of this project is to give caregivers their time and peace of mind back. By fully operating offline on local hardware, it guarantees that highly sensitive medical and financial data never leaves the user's device. It transforms a stressful stack of mail into an organized, searchable, and actionable digital inbox, empowering families to focus on what truly matters: spending quality time with their loved ones.