added cli tool

cli/src/test/kotlin/InsaneTest.kt

@@ -0,0 +1,22 @@
+import net.woggioni.jzstd.ZstdOutputStream
+import org.junit.jupiter.api.Test
+import java.nio.file.Files
+import java.nio.file.Paths
+
+class InsaneTest {
+
+    @Test
+    fun test2() {
+        val inputFile = Paths.get("/tmp/Richard_Dawkins_The_Selfish_Gene.pdf")
+        Files.newInputStream(inputFile).use { `is` ->
+            ZstdOutputStream.from(Files.newOutputStream(Paths.get("/tmp/Richard_Dawkins_The_Selfish_Gene.pdf.zst"))).use { os ->
+                val buffer = ByteArray(0x10000)
+                while (true) {
+                    val read = `is`.read(buffer)
+                    if (read < 0) break
+                    os.write(buffer, 0, read)
+                }
+            }
+        }
+    }
+}