adds flake and direnv setup

.envrc

@@ -0,0 +1,5 @@
+# shellcheck shell=bash
+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

flake.nix

@@ -0,0 +1,58 @@
+{
+  description = "A basic flake with a shell";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.systems.url = "github:nix-systems/default";
+  inputs.flake-utils = {
+    url = "github:numtide/flake-utils";
+    inputs.systems.follows = "systems";
+  };
+
+  outputs =
+    { nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          packages = with pkgs; [
+            bashInteractive
+
+            # Executables
+            nodejs
+            pnpm
+            biome
+            postgresql
+
+            # Dev Tools
+            typescript-language-server
+            astro-language-server
+          ];
+
+          shellHook = ''
+            export PORT=300
+            export PGDIR=$PWD/postgres
+            export PGHOST=$PGDIR
+            export PGDATA=$PGDIR/data
+            export PGLOG=$PGDIR/log
+            export DATABASE_URL="postgresql:///postgres?host=$PGDIR"
+
+            if test ! -d $PGDIR; then
+              mkdir $PGDIR
+            fi
+
+            if [[ ! -d "$PGDATA" ]]; then
+              initdb $PGDATA --auth=trust >/dev/null
+
+              cat >> "$PGDATA/postgresql.conf" <<-EOF
+                unix_socket_directories = '$PGHOST'
+              EOF
+            fi
+
+            echo "Bun Version: $(bun --version)"
+          '';
+        };
+      }
+    );
+}