Added FilterKeywords class (zerrium package)

app/src/main/java/zerrium/FilterKeywords.java

@@ -0,0 +1,28 @@
+package zerrium;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class FilterKeywords {
+    private static final ArrayList<String> FILTER_KEYWORDS = new ArrayList<>();
+
+    public static boolean append(String keyword){
+        if(keyword == null) return false;
+        FILTER_KEYWORDS.add(keyword);
+        return true;
+    }
+
+    public static boolean insert(String[] keywords){
+        if(keywords == null) return false;
+        FILTER_KEYWORDS.addAll(Arrays.asList(keywords));
+        return true;
+    }
+
+    public static boolean filter(String word){
+        if(word == null) return false;
+        for(String s:FILTER_KEYWORDS){
+            if(word.contains(s)) return true;
+        }
+        return false;
+    }
+}