application restructuring, added crc check when decoding yenc files

package.json

@@ -2,11 +2,13 @@
   "name": "usenet-indexer",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "src/bin/start.js",
   "type": "module",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start": "node src/index.js"
+    "start": "node src/bin/start.js",
+    "download": "node src/bin/download.js",
+    "nzb": "node src/bin/nzb.js"
   },
   "keywords": [],
   "author": "",
@@ -22,6 +24,7 @@
     "sqlite": "^5.1.1",
     "sqlite3": "^6.0.1",
     "xmlbuilder2": "^3.1.1",
-    "yencode": "^1.0.1"
+    "yencode": "^1.0.1",
+    "crc": "^4.3.2"
   }
 }