update readme

Author: kumar8317

README.md

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+# Forge-Node-Starter
+Starter Repo for node express server including database service layer on top of knex with postgres
+
+The express-server-lib exposes below methods that can be used to spin up multiple servers
+
+```
+import { Options, ServerApp } from "../express-server-lib";
+
+const serverName = "Server";
+
+const serverPort: number = config.get(`${serverName}.port`);
+
+const expressOptions: Options = {
+  serverName,
+  enableGlobalRateLimiter: config.get(`${serverName}.enableGlobalRateLimit`),
+  port: serverPort,
+  cors: { disable: true },
+  securityHeaders: {
+    disableAll: true,
+  },
+};
+const apiServer = new ServerApp(expressOptions);
+
+```
+This will spin up server with default configuration of middlewares like cors and security headers