Add scaladoc for scalatest integrations

Author: ultrasecreth

README.md

@@ -154,7 +154,7 @@ The trait has to be mixed **after** `org.mockito.MockitoSugar` in order to work,
 The code shown in the StackOverflow question would look like this if using this mechanism
 
 ```scala
-TestClass extends PlaySpec with MockitoSugar with ResetMocksAfterEachTest
+class MyTest extends PlaySpec with MockitoSugar with ResetMocksAfterEachTest
 
 private val foo = mock[Foo]
 

core/src/main/scala/org/mockito/integrations/scalatest/IdiomaticMockitoFixture.scala

@@ -1,8 +1,14 @@
 package org.mockito.integrations.scalatest
 
 import org.mockito._
-import org.scalatest.{Outcome, Suite, TestSuite}
+import org.scalatest.{ Outcome, Suite, TestSuite }
 
+/**
+ * It automatically wraps each test in a MockitoScalaSession so the implicit verifications are applied
+ *
+ * Just mix-in after your favourite suite, i.e. {{{class MyTest extends WordSpec with IdiomaticMockitoFixture}}}
+ *
+ */
 trait IdiomaticMockitoFixture extends TestSuite with IdiomaticMockito with ArgumentMatchersSugar { this: Suite =>
 
   abstract override def withFixture(test: NoArgTest): Outcome =

core/src/main/scala/org/mockito/integrations/scalatest/MockitoFixture.scala

@@ -3,6 +3,12 @@ package org.mockito.integrations.scalatest
 import org.mockito._
 import org.scalatest.{ Outcome, Suite, TestSuite }
 
+/**
+ * It automatically wraps each test in a MockitoScalaSession so the implicit verifications are applied
+ *
+ * Just mix-in after your favourite suite, i.e. {{{class MyTest extends WordSpec with MockitoFixture}}}
+ *
+ */
 trait MockitoFixture extends TestSuite with MockitoSugar with ArgumentMatchersSugar { this: Suite =>
 
   abstract override def withFixture(test: NoArgTest): Outcome =

core/src/main/scala/org/mockito/integrations/scalatest/ResetMocksAfterEachTest.scala

@@ -10,6 +10,13 @@ import scala.collection.JavaConverters._
 import scala.reflect.ClassTag
 import scala.reflect.runtime.universe.TypeTag
 
+/**
+  * It automatically resets each mock after a each test is run, useful when we need to pass the mocks to some framework
+  * once at the beginning of the test suite
+  *
+  * Just mix-in after your favourite suite, i.e. {{{class MyTest extends PlaySpec with MockitoSugar with ResetMocksAfterEachTest}}}
+  *
+  */
 trait ResetMocksAfterEachTest extends TestSuite with MockCreator { self: MockCreator =>
 
   private val mocksToReset = ConcurrentHashMap.newKeySet[AnyRef]().asScala