Add Bigcapital self-hosted software (#3857)

Co-authored-by: nodiscc <nodiscc@gmail.com>
Co-authored-by: Rabenherz112 <rabenherz@theravenhub.com>

README.md

@@ -1394,6 +1394,7 @@ _Related: [Inventory Management](#inventory-management), [Resource Planning - En
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 - [Bitcart](https://bitcart.ai) - A self-hosted cryptocurrencies payment processor and development platform. ([Demo](https://admin.bitcart.ai), [Source Code](https://github.com/bitcart)) `MIT` `Docker/Python/Nodejs`
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+- [Bigcapital](https://bigcapital.ly) - A self-hosted financial accounting and inventory management software for small to medium businesses. ([Source Code](https://github.com/bigcapitalhq/bigcapital)) `AGPL-3.0` `Docker`
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