Updated Criteria for a good color scheme (markdown)

Criteria-for-a-good-color-scheme.md

@@ -4,3 +4,59 @@
     - [Startify](https://github.com/mhinz/vim-startify)
     - [signify](https://github.com/mhinz/vim-signify) (change, delete, add sign should be readable)
 4. Sign column highlight should look good with other parts.
+5. Diff should be easy to view with this colorscheme.
+
+file1.java
+
+```
+public class File1 {
+
+  public int add (int a, int b)
+  {
+    log();
+    return a + b;
+  }
+
+  public int sub (int a, int b)
+  {
+    if (a == b)
+    {
+        return 0;
+    }
+    log();
+    return a - b;
+    // TOOD: JIRA1234
+  }
+
+}
+```
+
+file2.java
+```
+public class File1 {
+
+  public int sub (int a, int b)
+  {
+    // TOOD: JIRA1234
+    if ( isNull(a, b) )
+    {
+        return null
+    }
+    log();
+    return a - b;
+  }
+
+  public int mul (int a, int b)
+  {
+    if ( isNull(a, b) )
+    {
+        return null;
+    }
+    log();
+    return a * b;
+  }
+
+}
+```
+
+compare these two files with `nvim -d file1.java file2.java` too see if the diff color is readable.