added requirements.txt and nix flake

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1747542820,
+        "narHash": "sha256-GaOZntlJ6gPPbbkTLjbd8BMWaDYafhuuYRNrxCGnPJw=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "292fa7d4f6519c074f0a50394dbbe69859bb6043",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,36 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      pkgs = nixpkgs.legacyPackages.x86_64-linux;
+    in
+    with pkgs;
+    {
+      devShells.x86_64-linux.default = mkShell {
+        buildInputs = with python3Packages; [
+          hy
+          (buildPythonPackage rec {
+            pname = "hyrule";
+            version = "1.0.0";
+
+            src = fetchPypi {
+              inherit pname version;
+              hash = "sha256-SZyFjXNs6thVWhKbajYelY0DoRYqrcCQcdKMNC5t6Og=";
+            };
+
+            propagatedBuildInputs = [
+              pip
+              wheel
+              hy
+            ];
+          })
+          bleach
+          validators
+        ];
+      };
+    };
+}

requirements.txt

@@ -0,0 +1,3 @@
+hy>=1
+bleach>=6.2.0
+validators>=0.34.0