Update README.md

README.md

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-# KVK-search-worldwide-WE
-Simple search for Karlsruhe Virtual Catalog (worldwide) WebExtension
+# KVK Search (worldwide) WE
+Adds [KVK (Karlsruhe Virtual Catalog)](https://kvk.bibliothek.kit.edu/index.html?lang=en "KVK (Karlsruhe Virtual Catalog)") simple search with main focus on worldwide library and book trade catalogs to search engines.
+
+Search shortcut: Type 'kvkww' followed by your search phrase into the address bar.
+
+Search includes the following catalogs:
+- DNB (German National Library)
+- ÖNB (Austrian National Library)
+- swissbib (Swiss university libraries and the Swiss national library)
+- NLA (National Library of Australia)
+- Det Kongelige Bibliotek (Royal Danish Library)
+- Kansalliskirjasto (National Library of Finland)
+- BnF (Bibliothèque nationale de France)
+- British Library
+- NLI (National Library of Israel)
+- KB (National Library of the Netherlands)
+- BN (National Library of Poland)
+- RSL (Russian State Library)
+- BNE (National Library of Spain)
+- NK (National Library of the Czech Republic)
+- OSZK (Hungrian National Library)
+- Worldcat
+- Amazon.de, English Books
+- Google Books
+
+This software is released under the [GNU General Public License v2.0](LICENSE).
+
+See the file [LICENSE](LICENSE) included with this distribution for the terms
+of this license.