Added documentation for writing a unit test

Writing-a-unit-test.md

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+### Step 1: Create the unit test file
+
+Create the unit test file in src/test/java/com/rarchives/ripme/tst/ripper/rippers
+
+File should follow the naming scheme <Site>RipperTest.java
+
+### Step 2: Extend the RippersTest class
+
+public class YoursiteRipper extends RippersTest {
+
+### Step 3: Write the main unit test
+
+```java
+   public void test<Site>Rip() throws IOException {
+        <Site>Ripper ripper = new DribbbleRipper(new URL(<URL the ripper supports>));
+        testRipper(ripper);
+    }
+```
+
+You should do this for ever album type that the ripper supports
+
+### Step 4: Write tests for getGID and getAlbumTitle  // Optional!
+
+Althought not required you should write a unit test for getGID and getAlbumbTitle (If your ripper supports getAlbumbTitle)
+
+An example of both of these can be found in the zizki ripper 
+
+```java
+
+    public void testGetGID() throws IOException {
+        URL url = new URL("http://zizki.com/dee-chorde/we-got-spirit");
+        ZizkiRipper ripper = new ZizkiRipper(url);
+        assertEquals("dee-chorde", ripper.getGID(url));
+    }
+
+    public void testAlbumTitle() throws IOException {
+        URL url = new URL("http://zizki.com/dee-chorde/we-got-spirit");
+        ZizkiRipper ripper = new ZizkiRipper(url);
+        assertEquals("zizki_Dee Chorde_We Got Spirit", ripper.getAlbumTitle(url));
+    }
+```