set up dev environment

.gitignore

@@ -1,3 +1,7 @@
+# --> Nix
+.direnv/
+.envrc
+
 # ---> Android
 # Gradle files
 .gradle/

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1702539185,
+        "narHash": "sha256-KnIRG5NMdLIpEkZTnN5zovNYc0hhXjAgv6pfd5Z4c7U=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "aa9d4729cbc99dabacb50e3994dcefb3ea0f7447",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,43 @@
+{
+  description = "Dev environment for the Recount Mobile app - written in Kotlin";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = { self, nixpkgs}:
+    let
+
+      # Generate a user-friendly version number.
+      version = builtins.substring 0 8 self.lastModifiedDate;
+
+      # System types to support.
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system:
+        import nixpkgs { 
+          inherit system;
+          config.allowUnfree = true;
+        }
+      );
+
+    in {
+
+      devShells = forAllSystems (system:
+        let pkgs = nixpkgsFor.${system};
+        in{
+          default = pkgs.mkShell {
+            buildInputs = with pkgs; [
+              android-udev-rules
+              android-studio
+              android-tools
+            ];
+          };
+        });
+
+  };
+}