Buy me a coffee image added & license updated with dontaion details. Licensing rules defined.

Recyclable.Collections/LICENSE.md

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-The project & source code is free for educational & personal use. Commercial use requires one-time $10 donation for each developer seat.
+# License
+The project & source code is free for educational & personal use. **Any kind** of commercial use requires a donation, as prescribed below.
+
+# Donation requirements for a life-time, commercial use
+* Commercial license is paid one time.
+* It can be obtained by donaiting $10 for each developer seat, using the link provided below. If you hire 2 developers, you need to donate $20 for a life-time, commercial use of the current major version, e.g. 1.x.y.
+* Your license stays with you, if your developer moves somewhere else.
+* Every new major release requires obtaining a new license. Major releases will be released only if the number of new features justifies one.
+
+# Link for donations
+[![Donate](buy-me-a-coffee.svg)](https://www.buymeacoffee.com/mlemanczyk)

Recyclable.Collections/buy-me-a-coffee.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="236" height="20" role="img" aria-label="Buy me a coffee"><title>Buy me a coffee</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="236" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="137" height="20" fill="#555"/><rect x="137" width="99" height="20" fill="#4c1"/><rect width="236" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="695" y="150" fill="#010101" transform="scale(.1)" textLength="auto"><a href="https://www.buymeacoffee.com/mlemanczyk">Buy me a coffee</a></text><text x="695" y="140" transform="scale(.1)" fill="#fff" textLength="auto"><a href="https://www.buymeacoffee.com/mlemanczyk"/></text><text aria-hidden="true" x="705" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="890">Buy me a coffee</text><text x="695" y="142" transform="scale(.1)" fill="#fff" textLength="auto"><a href="https://www.buymeacoffee.com/mlemanczyk">Buy me a coffee</a></text><text aria-hidden="true" x="1890" y="142" fill="#010101" transform="scale(.1)" textLength="auto"><a href="https://www.buymeacoffee.com/mlemanczyk">$1 - $10</a></text></g></svg>

buy-me-a-coffee.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="236" height="20" role="img" aria-label="Buy me a coffee"><title>Buy me a coffee</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="236" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="137" height="20" fill="#555"/><rect x="137" width="99" height="20" fill="#4c1"/><rect width="236" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="695" y="150" fill="#010101" transform="scale(.1)" textLength="auto"><a href="https://www.buymeacoffee.com/mlemanczyk">Buy me a coffee</a></text><text x="695" y="140" transform="scale(.1)" fill="#fff" textLength="auto"><a href="https://www.buymeacoffee.com/mlemanczyk"/></text><text aria-hidden="true" x="705" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="890">Buy me a coffee</text><text x="695" y="142" transform="scale(.1)" fill="#fff" textLength="auto"><a href="https://www.buymeacoffee.com/mlemanczyk">Buy me a coffee</a></text><text aria-hidden="true" x="1890" y="142" fill="#010101" transform="scale(.1)" textLength="auto"><a href="https://www.buymeacoffee.com/mlemanczyk">$1 - $10</a></text></g></svg>