chore(README.md): update images and available languages section

docs(README.md): update contribution instructions and error reporting section

feat(translations): add German translation of Monero for Merchants flyer and README.md file
feat(translations): add images for German translation of Monero for Merchants flyer

feat(translation-german.md): add German translation for page 1 and page 2 of Monero for Merchants booklet
feat(Monero for Merchants Booklet - english.pdf): add English version of Monero for Merchants booklet

feat(README.md): add Monero for Merchants booklet in English
feat(README.md): add download link for PDF
feat(README.md): add option to create an issue for spelling or other mistakes
feat(README.md): add images for page 1, page 2, preview 1, and preview 2

feat(translation-english.md): add English translation for page 1 and page 2 of the Monero for Merchants website

translations/de/README.md

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+# Monero für Händler
+
+Eine druckbare Broschüre, um Händler dazu zu bewegen, Monero zu akzeptieren.
+
+##[⤓ Download PDF](./Monero%20fuer%20Haendler%20Flyer%20-%20deutsch.pdf)
+
+Haben Sie einen Rechtschreib- oder anderen Fehler gefunden? [Schreiben Sie es uns](https://github.com/ASchmidt1024/monero-for-merchants-booklet/issues/new/choose). Danke.
+
+![Seite 1](images/Screenshot%202023-09-02%20at%2009.04.33.png)
+
+![Seite 2](images/Screenshot%202023-09-02%20at%2009.04.38.png)
+
+![Vorschau 1](images/Screenshot%202023-09-02%20at%2009.04.43.png)
+
+![Vorschau 2](images/Screenshot%202023-09-02%20at%2009.04.51.png)

translations/en/README.md

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+# Monero for Merchants
+
+A printable booklet to attract merchants to accept Monero.
+
+##[⤓ Download PDF](./Monero%20for%20Merchants%20Booklet%20-%20english.pdf)
+
+Found a spelling or other mistake? Feel free to [create an issue](https://github.com/ASchmidt1024/monero-for-merchants-booklet/issues/new/choose). Thank you.
+
+![Page 1](images/Screenshot%202023-08-31%20at%2007.50.14.png)
+
+![Page 2](images/Screenshot%202023-08-31%20at%2007.50.18.png)
+
+![Preview 1](images/Screenshot%202023-08-31%20at%2007.50.24.png)
+
+![Preview 2](images/Screenshot%202023-08-31%20at%2007.50.28.png)