Add draft donor agreement copy

docs/donor-agreement.md

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+# Donor Agreement
+
+## Before you share your points
+
+SlugSwap connects donors and requesters on campus. This agreement explains what happens when you join as a donor so there are no surprises.
+
+---
+
+## How it works
+
+You set a monthly contribution amount. Each week, your share of that amount becomes part of a shared pool that verified UCSC students can draw from.
+
+When a requester generates a claim code, SlugSwap uses your linked dining account to produce a barcode on their behalf. When they scan it at a dining terminal, points are deducted from your balance. This is intentional — that's how the sharing works.
+
+---
+
+## What you're authorizing
+
+By linking your GET account and activating donor status, you're authorizing SlugSwap to:
+
+- Connect to your school dining account (GET Tools) to generate claim codes on your behalf
+- Draw from your Flexi Dollars, Banana Bucks, and Slug Points up to your contribution limit
+- Do this automatically when requesters claim from the pool
+
+We do not store your UCSC or GET password. Your credentials are encrypted and used only to generate codes.
+
+We may allocate and redistribute contributions across the pool at our discretion to maintain pool health, fairness, and availability for requesters.
+
+---
+
+## You stay in control
+
+- **Pause anytime** — no codes are generated from your account while paused
+- **Update your monthly amount** anytime; changes take effect the next weekly cycle
+- **Stop donating** anytime; your account is effectively removed from pool activity
+
+**On limits:** When you reach your contribution limit, SlugSwap stops generating claim codes from your account. We can't intercept purchases you make directly at dining terminals, but no SlugSwap-generated activity will occur beyond your set limit.
+
+---
+
+## Fairness
+
+- Requesters have weekly allowance limits so no single person can drain the pool
+- We track usage and can suspend access for abuse
+- You can see your weekly and monthly impact (people helped, points contributed) in the app
+
+---
+
+## Questions
+
+If you see unexpected activity on your dining account, contact us at [support contact]. We'll investigate and work to make it right.