Update README.md

Adds a slightly richer example to the suite local fixture

README.md

@@ -110,15 +110,21 @@ MUnit supports reusable suite-local fixtures that are instantiated only once for
 
 ```scala
 import cats.effect.{IO, Resource}
+import fs2.io.file.Files
 
 class SuiteLocalExampleSuite extends CatsEffectSuite {
 
   val myFixture = ResourceSuiteLocalFixture(
     "my-fixture",
-    Resource.make(IO.unit)(_ => IO.unit)
+    Files[IO].tempFile
+  )
+
+  val tempFileFixture = ResourceSuitLocalFixture(
+    "temp-file",
+    Files[IO].tempFile
   )
 
-  override def munitFixtures = List(myFixture)
+  override def munitFixtures = List(myFixture, tempFileFixture)
 
   test("first test") {
     IO(myFixture()).assertEquals(())
@@ -127,6 +133,12 @@ class SuiteLocalExampleSuite extends CatsEffectSuite {
   test("second test") {
     IO(myFixture()).assertEquals(())
   }
+
+  test("third test") {
+    IO(tempFileFixture()).flatMap { file =>
+      assertIO(Files[IO].exists(file), true)
+    }
+  }
 
 }
 ```