add Constants file for shared configuration values

src/main/kotlin/com/abmo/CliArguments.kt

@@ -1,5 +1,7 @@
 package com.abmo
 
+import com.abmo.Constant.DEFAULT_CONCURRENT_DOWNLOAD_LIMIT
+
 class CliArguments(private val args: Array<String>) {
 
     fun getHeaders(): Map<String, String>? {
@@ -49,7 +51,7 @@ class CliArguments(private val args: Array<String>) {
             }
         }
 
-        return 6
+        return DEFAULT_CONCURRENT_DOWNLOAD_LIMIT
     }
 
 }

src/main/kotlin/com/abmo/Constant.kt

@@ -0,0 +1,7 @@
+package com.abmo
+
+object Constant {
+
+    const val DEFAULT_CONCURRENT_DOWNLOAD_LIMIT = 6
+
+}

src/main/kotlin/com/abmo/model/Config.kt

@@ -1,11 +1,12 @@
 package com.abmo.model
 
+import com.abmo.Constant.DEFAULT_CONCURRENT_DOWNLOAD_LIMIT
 import java.io.File
 
 data class Config(
     val url: String,
     val resolution: String,
     var outputFile: File?,
     val header: Map<String, String>? = null,
-    val connections: Int = 6
+    val connections: Int = DEFAULT_CONCURRENT_DOWNLOAD_LIMIT
 )