Moved some Java files to kotlin (commons-app#3439)

* Converted NetworkConnectionType.java to Kotlin

* Converted Urls.java to Kotlin and Updated AboutActivity

* Improved code quality

Author: madhurgupta10

app/src/main/java/fr/free/nrw/commons/Urls.java

@@ -0,0 +1,14 @@
+package fr.free.nrw.commons
+
+internal object Urls {
+    const val NEW_ISSUE_URL = "https://github.com/commons-app/apps-android-commons/issues"
+    const val GITHUB_REPO_URL = "https://github.com/commons-app/apps-android-commons"
+    const val WEBSITE_URL = "https://commons-app.github.io"
+    const val CREDITS_URL = "https://github.com/commons-app/apps-android-commons/blob/master/CREDITS"
+    const val FAQ_URL = "https://github.com/commons-app/apps-android-commons/wiki/Frequently-Asked-Questions"
+    const val PLAY_STORE_URL = "https://play.google.com/store/apps/details?id=fr.free.nrw.commons"
+    const val TRANSLATE_WIKI_URL = "https://translatewiki.net/w/i.php?title=Special:Translate&group=commons-android-strings&filter=%21translated&action=translate&language="
+    const val FACEBOOK_WEB_URL = "https://www.facebook.com/1921335171459985"
+    const val FACEBOOK_APP_URL = "fb://page/1921335171459985"
+    const val FACEBOOK_PACKAGE_NAME = "com.facebook.katana"
+}

app/src/main/java/fr/free/nrw/commons/Urls.kt

@@ -0,0 +1,5 @@
+package fr.free.nrw.commons.utils.model
+
+enum class NetworkConnectionType {
+    WIFI, TWO_G, THREE_G, FOUR_G, UNKNOWN
+}