second draft of the Bazaar plugin

signed-off-by: lykkeaxlin <lykkeaxlin@hotmail.com>

Co-authored-by: klaraab <klarabroman@live.se>
Signed-off-by: Lykke Axlin <lykkeaxlin@hotmail.com>

plugins/bazaar-backend/README.md

@@ -0,0 +1,49 @@
+# Bazaar Backend
+
+Welcome to the Bazaar backend plugin!
+
+# Installation
+
+## Install the package
+
+```bash
+# From your Backstage root directory
+cd packages/backend
+yarn add @backstage/plugin-bazaar-backend
+```
+
+## Adding the plugin to your `packages/backend`
+
+You'll need to add the plugin to the router in your `backend` package. You can do this by creating a file called `packages/backend/src/plugins/bazaar.ts`
+
+```tsx
+import { PluginEnvironment } from '../types';
+import { createRouter } from '@internal/plugin-bazaar-backend';
+
+export default async function createPlugin({
+  logger,
+  database,
+  config,
+}: PluginEnvironment) {
+  return await createRouter({ logger, config, database });
+}
+```
+
+With the `bazaar.ts` router setup in place, add the router to `packages/backend/src/index.ts`:
+
+```diff
++ import bazaar from './plugins/bazaar';
+
+async function main() {
+  ...
+  const createEnv = makeCreateEnv(config);
+
+  const catalogEnv = useHotMemoize(module, () => createEnv('catalog'));
++    const bazaarEnv = useHotMemoize(module, () => createEnv('bazaar'));
+
+  const apiRouter = Router();
++  apiRouter.use('/bazaar', await bazaar(bazaarEnv));
+  ...
+  apiRouter.use(notFoundHandler());
+
+```