Add summary of GDPD and some other requirements

GDPdU.md

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+# GDPdU Requirements
+
+1. Complete storage of all documents (order, delivery note, invoice, accounting etc.)
+2. Complete history of same document in case of changes
+3. Long term storage
+4. Permission management to prevent altering
+5. Encrypting sensitive data (recommended not regulated)
+6. Deleting of data older than x must be possible (not earlier)
+7. Getting all data related to one person or issue must be possible
+8. Not certificate required (for Germany)
+9. Export control check (not GDPdU but still required)
+10. Deleting none business relevant data of user must be possible (EU law)
+11. Export of GDPdU files must be possible
+12. "E-balance must be possible" (doesn't have to be but then client has to create them manually)
+13. Regular backups must be ensured (also required for data security reasons)
+14. Unique invoice numbers
+15. Consecutive invoice numbers
+16. Correct invoice (delivery addrass, invoice address, date, vat id, items, amounts, single price, values, tax, discount, delivery terms, payment terms, skonti, currency, exchange rate, person who created invoice)
+17. Document correct working by logging every activity (e.g. invoice reduces stock and the stock log needs to reference the invoice id etc.)
+18. Every posting has to be related to a voucher
+19. Comment for posting possible
+20. IKS (cross check different areas e.g. P&L / Balance, allow to print checklists like all postings etc.)
+21. Document changes in settings (e.g. fiscal year change, change of invoice number layout)
+22. Check if documents are created correctly (all invoices where sent to customers)
+23. Exports need to be possible in excel and pdf
+24. Documentation of workflows (technical and manual part)