Add test using ResourceManager

Author: fmagin

src/test/kotlin/SampleTest.kt

@@ -1,4 +1,5 @@
 import ghidra.examples.Sample
+import resources.ResourceManager
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -10,4 +11,10 @@ class SampleTest {
         val expected = 42
         assertEquals(expected, testSample.sum(40, 2))
     }
+
+    @Test
+    fun testResourceManager() {
+        val testJson = ResourceManager.getResource("testfile.txt")
+        assertEquals(testJson.readText(), "test")
+    }
 }

src/test/resources/.gitkeep

@@ -0,0 +1 @@
+test