Setup CI testing and building (#1)

We want CI to be able to build the ShadowJAR for the CLI tool.

Reviewed-on: #1

src/main/kotlin/ziputils/CentralDirectoryFileHeader.kt

@@ -3,6 +3,9 @@ package ziputils
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
 
+/**
+ * Represents a partial ZIP central directory file header.
+ */
 internal class CentralDirectoryFileHeader(
     val compressedSize: UInt,
     val uncompressedSize: UInt,
@@ -22,8 +25,11 @@ internal class CentralDirectoryFileHeader(
         const val SIZE = 46
 
         /**
-         * Create CentralDirectoryFileHeader from raw byte data.
-         * @throws InvalidDataException provided ByteArray is not a supported CEN.
+         * Create `CentralDirectoryFileHeader` from raw byte data.
+         * @throws InvalidDataException provided `ByteArray` is not a supported CEN.
+         * @param data Raw byte data.
+         * @param offset Skip first <offset> bytes in data array.
+         * @return A `CentralDirectoryFileHeader`.
          */
         @Throws(InvalidDataException::class)
         fun fromByteArray(data: ByteArray, offset: Int): CentralDirectoryFileHeader {