constants desc

challenges/constants/description.md

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+In Rust, **constants** are values that are bound to a name and are **not allowed to change**. Constants are always immutable and are declared using the `const` keyword. They must be annotated with their type, and they can be set only to a constant expression.
+
+In this challenge, you will define and use a constant in Rust. This will help you understand how to declare constants and how they can be utilized in your programs.
+
+## Your task
+
+- Define a constant named `MAX_SIZE` with a value of `100`.
+- Ensure that `MAX_SIZE` has the type `i32`.
+- Return the value of `MAX_SIZE` from the `main` function.
+
+## Hints
+
+- Use the `const` keyword to define the constant.
+- Ensure you **specify the type** of the constant explicitly.