Added character count solution

README.md

@@ -44,6 +44,7 @@ other languages.
 - Buying a Car (https://www.codewars.com/kata/554a44516729e4d80b000012)
 - Spinning Words (https://www.codewars.com/kata/5264d2b162488dc400000001)
 - Camel Case (https://www.codewars.com/kata/517abf86da9663f1d2000003)
+- Count Characters (https://www.codewars.com/kata/52efefcbcdf57161d4000091)
 
 #### Kata 7
 

src/codewars/count_characters.rs

@@ -0,0 +1,26 @@
+use std::collections::HashMap;
+
+fn count(input: &str) -> HashMap<char, i32> {
+    input.chars().fold(HashMap::new(), |mut acc, curr| {
+        *acc.entry(curr).or_insert(0) += 1;
+        acc
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use std::collections::HashMap;
+    use crate::codewars::count_characters::count;
+
+    #[test]
+    fn test_count() {
+        let actual = count("abcabc");
+
+        let expected = HashMap::from([
+            ('a', 2),
+            ('b', 2),
+            ('c', 2)
+        ]);
+        assert_eq!(actual, expected)
+    }
+}

src/codewars/mod.rs

@@ -44,3 +44,4 @@ mod cats_and_shelves;
 mod people_on_the_bus;
 mod summation;
 mod not_secure;
+mod count_characters;