feat: add Justfile

Justfile

@@ -0,0 +1,24 @@
+# just is a handy way to save and run project-specific commands.
+#
+# https://github.com/casey/just
+
+# list all tasks
+default:
+  just --list
+
+# Format the code
+fmt:
+  treefmt
+alias f := fmt
+
+# Start IDEA in this folder
+idea:
+  nohup idea-ultimate . > /dev/null 2>&1 &
+
+# Start VsCode in this folder
+code:
+  code .
+
+# Checks the source with nix
+nix-check:
+  nix flake check