feat(readme): document built-in ACME directory server and CA capabilities

package.json

@@ -2,7 +2,7 @@
   "name": "@push.rocks/smartacme",
   "version": "9.2.0",
   "private": false,
-  "description": "A TypeScript-based ACME client for LetsEncrypt certificate management with a focus on simplicity and power.",
+  "description": "A TypeScript-based ACME client and server for certificate management with built-in CA, supporting LetsEncrypt and custom ACME authorities.",
   "main": "dist_ts/index.js",
   "typings": "dist_ts/index.d.ts",
   "type": "module",
@@ -20,6 +20,9 @@
     "LetsEncrypt",
     "TypeScript",
     "certificate management",
+    "certificate authority",
+    "ACME server",
+    "PKI",
     "DNS challenges",
     "SSL/TLS",
     "secure communication",
@@ -28,9 +31,11 @@
     "crypto",
     "MongoDB",
     "dns-01 challenge",
+    "http-01 challenge",
     "token-based challenges",
     "certificate renewal",
-    "wildcard certificates"
+    "wildcard certificates",
+    "RFC 8555"
   ],
   "author": "Task Venture Capital GmbH",
   "license": "MIT",