Add a "Bitcoin Dev Kit" badge

Suggested by @futurepaul, generated using shields.io:
https://img.shields.io/badge/Bitcoin Dev Kit-black?color=blue&labelColor=gray&logoWidth=24&logo=...

diff --git a/static/badge/bitcoin-dev-kit.svg b/static/badge/bitcoin-dev-kit.svg
new file mode 100644 (file)
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+++ b/static/badge/bitcoin-dev-kit.svg
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