Add changelog

Changelog.md

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+# Changelog
+
+## 1.0.4.0
+
+Since this release is substantial, we invite your to read our [blog post](https://blog.btcpayserver.org/btcpay-server-1-0-4-0/) as well.
+
+### Bug fixes
+* Better RBF and Double spend handling
+    * Fix: Bumping an invoice payment would sometimes add to the customer Network fee.
+    * Fix: A double spent transaction would sometimes show as never confirming in the invoice details instead of showing as double spent
+* Fix: do not allow 0 amount invoices in crowdfund or payment requests
+* Fix: Make 0 amount invoices marked as paid instantly
+* Fix: Payment request clone button would throw an error
+* Fix: Could not remove a user if the user was using the storage file feature
+* Make sure sponsor logos show up nicely on all screen sizes
+* UI Fixes
+    * Replace `Paid summary` by `Invoice Summary` in the invoice preview of the invoice list page
+    * Center supporter logos on the 404 error page
+    * When creating a new hotwallet, do not ask for the address confirmation step
+
+
+### Features
+* Payjoin support for stores (Receiving)
+* Payjoin support in the internal wallet (Sending)
+* Coin Selection feature in the internal wallet
+* Direct integration to Bitflyer rate provider
+* Allow generation of new address in Wallet Receive page, even if the current one still not used.
+* New invoice default theme
+* New invoice dark theme
+* New site default theme
+* New site dark theme
+* Camera QR Code scanner for Wallet
+* In the invoice checkout, ability to copy the BIP21 payment string
+* Add additional server policy for hot wallet RPC import
+
+### Greenfield API
+* Greenfield API Permissions rework for API Keys & Basic Auth support
+   * Granular permissions
+   * Endpoint for creating a new user
+   * Endpoint for creating API Keys
+   * More details in the documentation
+* Greenfield API C# Client
+
+### Altcoins
+
+* Decimal precision for Liquid assets fixes
+* Add L-CAD support for Liquid
+* Monero stability fixes
+
+## Thanks to contributors
+
+* binarydreaming
+* britttttkelly
+* dennisreimann
+* francispoulios
+* joerlop
+* mbomb1231
+* mikewchan
+* mrkukks
+* nicolasdorier
+* pavlenex
+* rockstardev
+* ubolator
+* vswee