first commit

modules-file/src/main.rs

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+mod math;
+mod meth;
+
+fn main() {
+    // a module is a way to group related code together. You can define modules inline or sepearte
+    // file 
+    let sum = math::add(2,3);
+    println!("{}", sum);
+
+    //using that nested meth module 
+    let mult = meth::advanced::mult(4, 5);
+    println!("{}", mult);
+}

modules-file/src/math.rs

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+pub fn add(a:i32, b:i32)->i32{
+    return a+b;
+}

modules-file/src/meth/advanced.rs

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+pub fn mult(i:i32, x:i32)->i32{
+    return i*x;
+}

modules-file/src/meth/mod.rs

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+pub mod advanced;