And add .envrc (#32)

Author: kixelated

.envrc

@@ -0,0 +1,12 @@
+# Automatically load the Nix development shell when entering this directory
+# Requires direnv: https://direnv.net/
+#
+# To enable:
+#   1. Install direnv
+#   2. Run: direnv allow
+#
+# This will automatically install all required dependencies for the project.
+if ! has nix_direnv_version || ! nix_direnv_version 3.1.0; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.1.0/direnvrc" "sha256-yMJ2OVMzrFaDPn7q8nCBZFRYpL/f0RcHzhmw/i6btJM="
+fi
+use_flake

.gitignore

@@ -3,3 +3,4 @@ target/
 *.mp4
 *.fmp4
 debug/
+.direnv/