add devenv

Signed-off-by: Florian Brandes <florian.brandes@posteo.de>

devenv.nix

@@ -0,0 +1,38 @@
+{ pkgs, lib, config, inputs, ... }:
+
+{
+  # https://devenv.sh/basics/
+  # env.GREET = "devenv";
+
+  # https://devenv.sh/packages/
+  # packages = [ pkgs.git ];
+
+  # https://devenv.sh/scripts/
+  # scripts.hello.exec = "echo hello from $GREET";
+
+  # enterShell = ''
+  #   hello
+  #   git --version
+  # '';
+
+  # https://devenv.sh/tests/
+  # enterTest = ''
+  #   echo "Running tests"
+  #   git --version | grep "2.42.0"
+  # '';
+
+  # https://devenv.sh/services/
+  # services.postgres.enable = true;
+
+  # https://devenv.sh/languages/
+  languages.nix.enable = true;
+  languages.python.enable = true;
+  
+  # https://devenv.sh/pre-commit-hooks/
+  # pre-commit.hooks.shellcheck.enable = true;
+
+  # https://devenv.sh/processes/
+  # processes.ping.exec = "ping example.com";
+
+  # See full reference at https://devenv.sh/reference/options/
+}