implemented a lot of features

lib/spotnet/index.ts

@@ -0,0 +1,7 @@
+/**
+ * Spotnet (free.pt) spots, independent of AdonisJS: header parsing and
+ * signature checks after Spotweb, the spot XML and its compressed NZB.
+ * See CONCEPT.md (D29).
+ */
+export { parseSpotHeader, verifySpotHeader, spotterId, moderationTarget, checkRsaSignature, spotUnprepareBase64, SPOTNET_KEYS, type SpotHeader } from './header.js'
+export { parseSpotXml, parseSpotArticleHeaders, decodeSpotBinary, type SpotXml } from './xml.js'