Support nix shell environment.

Author: YoEight

src/.envrc

@@ -0,0 +1 @@
+use flake

src/flake.lock

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+{
+  description = "A Nix-flake-based EventStoreDB development environment";
+
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems =
+        [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f:
+        nixpkgs.lib.genAttrs supportedSystems
+        (system: f { pkgs = import nixpkgs { inherit system; }; });
+    in {
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell rec {
+          packages = with pkgs; [
+            dotnetCorePackages.sdk_8_0
+            dotnetCorePackages.aspnetcore_8_0
+            glibcLocales
+            bintools
+            mono
+          ];
+
+          DOTNET_ROOT = "${pkgs.dotnetCorePackages.sdk_8_0}";
+        };
+      });
+    };
+}