Adds tests for API

api/src/main/java/com/github/gtache/autosubtitle/File.java

@@ -5,10 +5,20 @@ import java.io.InputStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
 
+/**
+ * Represents a file
+ */
 public interface File {
+    /**
+     * @return The file input stream
+     * @throws IOException If an I/O error occurs
+     */
     default InputStream getInputStream() throws IOException {
         return Files.newInputStream(path());
     }
 
+    /**
+     * @return The file path
+     */
     Path path();
 }