doc: add fromBunLock to docs

Author: aster-void

readme.md

@@ -76,6 +76,34 @@ With nix-prisma-utils it's the other way around. You can simply install prisma t
 
 ```
 
+### Using `bun`
+
+```nix
+{
+  inputs.pkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.prisma-utils.url = "github:VanCoding/nix-prisma-utils";
+
+  outputs =
+    { pkgs, prisma-utils, ... }:
+    let
+      nixpkgs = import pkgs { system = "x86_64-linux"; };
+      prisma =
+        (prisma-utils.lib.prisma-factory {
+          inherit nixpkgs;
+          prisma-fmt-hash = "sha256-4zsJv0PW8FkGfiiv/9g0y5xWNjmRWD8Q2l2blSSBY3s="; # just copy these hashes for now, and then change them when nix complains about the mismatch
+          query-engine-hash = "sha256-6ILWB6ZmK4ac6SgAtqCkZKHbQANmcqpWO92U8CfkFzw=";
+          libquery-engine-hash = "sha256-n9IimBruqpDJStlEbCJ8nsk8L9dDW95ug+gz9DHS1Lc=";
+          schema-engine-hash = "sha256-j38xSXOBwAjIdIpbSTkFJijby6OGWCoAx+xZyms/34Q=";
+        }).fromBunLock
+          ./bun.lock; # <--- path to our bun.lock file that contains the version of prisma-engines.
+          # NOTE: does not work with bun.lockb!
+    in
+    {
+      devShells.x86_64-linux.default = nixpkgs.mkShell { shellHook = prisma.shellHook; };
+    };
+}
+```
+
 ## Testing
 
 `nix run .#test-all`