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/did.ts

@@ -0,0 +1,34 @@
+/**
+ * DID (Decentralized Identifier) helpers
+ */
+
+export interface DIDDocument {
+  id: string;
+  '@context': string[];
+  verificationMethod: VerificationMethod[];
+  authentication: string[];
+}
+
+export interface VerificationMethod {
+  id: string;
+  type: string;
+  controller: string;
+  publicKeyMultibase?: string;
+}
+
+export class DIDResolver {
+  async resolve(did: string): Promise<DIDDocument> {
+    // Implementation for DID resolution
+    throw new Error('Not implemented');
+  }
+
+  async verifySignature(
+    did: string,
+    message: string,
+    signature: string
+  ): Promise<boolean> {
+    // Implementation for signature verification
+    throw new Error('Not implemented');
+  }
+}
+

packages/auth/src/eidas.ts

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+/**
+ * eIDAS (electronic IDentification, Authentication and trust Services) helpers
+ */
+
+export interface EIDASConfig {
+  providerUrl: string;
+  apiKey: string;
+}
+
+export interface EIDASSignature {
+  signature: string;
+  certificate: string;
+  timestamp: Date;
+}
+
+export class EIDASProvider {
+  constructor(private config: EIDASConfig) {}
+
+  async requestSignature(document: string): Promise<EIDASSignature> {
+    // Implementation for eIDAS signature request
+    throw new Error('Not implemented');
+  }
+
+  async verifySignature(signature: EIDASSignature): Promise<boolean> {
+    // Implementation for eIDAS signature verification
+    throw new Error('Not implemented');
+  }
+}
+

packages/auth/src/index.ts

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+/**
+ * The Order Auth Package
+ */
+
+export * from './oidc';
+export * from './did';
+export * from './eidas';
+

packages/auth/src/oidc.ts

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+/**
+ * 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');
+  }
+}
+