Support nix shell environment.

.envrc

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+use flake

flake.nix

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+{
+  description = "A Nix-flake-based EventStoreDB Java client development environment";
+
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+
+  outputs = { self, nixpkgs }:
+    let
+      javaVersion = 11; # Change this value to update the whole stack
+      overlays = [
+        (final: prev: rec {
+          jdk = prev."jdk${toString javaVersion}";
+          # gradle = prev.gradle.override { java = jdk; };
+        })
+      ];
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit overlays system; };
+      });
+    in
+    {
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [ jdk11 ];
+        };
+      });
+    };
+}