002-ok + readme

002/solution.rs

@@ -0,0 +1,17 @@
+fn main() {
+    let mut a1 = 1;
+    let mut a2 = 2;
+    let mut sum = 0;
+
+    while a2 <= 4_000_000 {
+        if a2 % 2 == 0 {
+            sum += a2;  
+        }
+        let a_new = a1 + a2;
+        a1 = a2;
+        a2 = a_new;
+        // println!("{}", a_new);
+    }
+    println!("{}", sum);
+}
+

README.md

@@ -5,3 +5,9 @@ no to actually solve all problems
 
 https://projecteuler.net
 
+## run soultion
+ 
+```bash
+cd 001
+rustc solution.rs && solution
+```