Add design and product documentation

PRODUCT.md

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+# Product — Orbit Academy
+
+Status: approved baseline.
+
+## Audience and job
+
+Prospective and active cohort learners need to understand the program, evaluate mentors and outcomes, follow weekly artifacts, and complete an informed admissions journey.
+
+## Primary journeys
+
+1. Compare programs, schedule, workload, outcomes, and cohort fit.
+2. Inspect curriculum artifacts, critiques, mentors, and alumni evidence.
+3. Apply with clear expectations and later navigate cohort/community information.
+
+## Non-goals
+
+- No guaranteed career outcomes, invented alumni claims, or vague curriculum lists.
+
+## Success criteria
+
+The learning model is tangible, admissions requirements are explicit, and the visual identity remains memorable without reducing readability.