Add .tool-versions file for Node.js version management 🎉🚀

- Created a new file `.tool-versions` to specify the Node.js version as 18 🐢💻
- This change helps ensure consistency across development environments and makes sure everyone is on the same version of Node.js, preventing any "but it works on my machine!" shenanigans! 😅🤦‍♂️
- This will also aid in toolchain management and reduce headaches for new developers onboarding to the project. Welcome to seamless collaboration! 🎊🤝

.tool-versions

@@ -0,0 +1 @@
+node 18