Add prisma7 README and remove completed project artifacts

packages/prisma7/README.md

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+# `@prisma/prisma7`
+
+Compatibility package for running the Prisma 7 CLI alongside a newer `prisma` package in the same project.
+
+The package installs the `prisma7` executable and delegates to the exact matching Prisma 7 CLI version. For example:
+
+```bash
+pnpm add -D prisma@8 @prisma/prisma7@7
+pnpm add @prisma/client@7
+
+pnpm prisma --version
+pnpm prisma7 --version
+```
+
+Use `prisma7` anywhere you would normally invoke the Prisma 7 CLI:
+
+```bash
+pnpm prisma7 generate
+pnpm prisma7 migrate dev
+pnpm prisma7 studio
+```
+
+## Prisma Config
+
+Import Prisma Config helpers from the scoped compatibility package:
+
+```ts
+import { defineConfig, env } from '@prisma/prisma7/config'
+
+export default defineConfig({
+  schema: 'prisma/schema.prisma',
+  datasource: {
+    url: env('DATABASE_URL'),
+  },
+})
+```
+
+The package is a compatibility wrapper, not a separate Prisma implementation. Its version is kept in lockstep with its exact `prisma` dependency.