add forgotten file, fix table

README.rst

@@ -47,7 +47,7 @@ LivInTheLookingGlass’s Project Euler solutions
 +-------------------------------------------+---------------+
 | Code Coverage (in progress)               | |Coverage|    |
 +-------------------------------------------+---------------+
-y| Code Scanning                             | |CodeQL| |br| |
+| Code Scanning                             | |CodeQL| |br| |
 |                                           | |ESLint| |br| |
 |                                           | |RustClippy|  |
 +-------------------------------------------+---------------+

rust/src/p0004.rs

@@ -0,0 +1,32 @@
+/*
+Project Euler Problem 4
+
+I couldn't figure out how to do this as efficiently as I would have liked. I am
+SURE that there is a better way to check if a number is a palindrome, but I
+could not think of one.
+
+Problem:
+
+A palindromic number reads the same both ways. The largest palindrome made from
+the product of two 2-digit numbers is 9009 = 91 × 99.
+
+Find the largest palindrome made from the product of two 3-digit numbers.
+*/
+use itertools::Itertools;
+
+fn is_palindrome(x: u64) -> bool {
+    let s = x.to_string();
+    return s == s.chars().rev().collect::<String>();
+}
+
+pub fn p0004() -> u64 {
+    let mut answer: u64 = 0;
+    for v in (100..1000).combinations(2) {
+        let p = v.into_iter().product();
+        if is_palindrome(p) && p > answer {
+            answer = p;
+        }
+    }
+    return answer;
+}
+