Update README.md to provide a comprehensive overview of The Order monorepo, including repository structure, quickstart guide, development workflow, and contribution guidelines.

packages/auth/src/oidc.ts

@@ -0,0 +1,31 @@
+/**
+ * OIDC/OAuth2 helpers
+ */
+
+export interface OIDCConfig {
+  issuer: string;
+  clientId: string;
+  clientSecret: string;
+  redirectUri: string;
+}
+
+export class OIDCProvider {
+  constructor(private config: OIDCConfig) {}
+
+  async getAuthorizationUrl(state: string): Promise<string> {
+    const params = new URLSearchParams({
+      client_id: this.config.clientId,
+      redirect_uri: this.config.redirectUri,
+      response_type: 'code',
+      scope: 'openid profile email',
+      state,
+    });
+    return `${this.config.issuer}/authorize?${params.toString()}`;
+  }
+
+  async exchangeCodeForToken(code: string): Promise<string> {
+    // Implementation for token exchange
+    throw new Error('Not implemented');
+  }
+}
+