Add slow solution to romanToInt

cediackermann/challenges/romanToInt/BUILD

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+load("@rules_java//java:defs.bzl", "java_binary")
+
+package(default_visibility = ["//visibility:public"])
+
+java_binary(
+    name = "romanToInt",
+    main_class = "cediackermann.challenges.houseRobber.Main",
+    srcs = glob(["*.java"]),
+    deps = [
+    ],
+)

cediackermann/challenges/romanToInt/Main.java

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+package cediackermann.challenges.romanToInt;
+
+public class Main {
+    public static void main(String[] args) {
+        Solution sol = new Solution();
+        System.out.println(        
+            sol.romanToInt("MCMXCIV")
+        );        
+    }
+    
+}

cediackermann/challenges/romanToInt/Solution.java

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+package cediackermann.challenges.romanToInt;
+
+import java.util.HashMap;
+import java.util.Map;
+
+class Solution {
+    private final Map<String, Integer> romanLetters = new HashMap<>();
+    public Solution(){
+        romanLetters.put("I", 1);
+        romanLetters.put("V", 5);
+        romanLetters.put("X", 10);
+        romanLetters.put("L", 50);
+        romanLetters.put("C", 100);
+        romanLetters.put("D", 500);
+        romanLetters.put("M", 1000);
+    }
+    public int romanToInt(String s) {
+        int solution = 0;
+        for (int i = 0; i < s.length(); i++) {
+            if (i + 1 <= s.length() - 1) {
+                if (this.romanLetters.get(Character.toString(s.charAt(i))) < this.romanLetters.get(Character.toString(s.charAt(i + 1)))) {
+                    solution += this.romanLetters.get(Character.toString(s.charAt(i+1))) - this.romanLetters.get(Character.toString(s.charAt(i)));
+                    i++;
+                } else{
+                    solution += this.romanLetters.get(Character.toString(s.charAt(i)));
+                }   
+            } else{
+                solution += this.romanLetters.get(Character.toString(s.charAt(i)));
+            }
+        }
+        return solution;
+    }
+}