Added userName and fullUserName to ProcessInfo

Marked NSFullUserName() as Unimplemented

Author: pvieito

Foundation/NSPathUtilities.swift

@@ -588,6 +588,10 @@ public func NSUserName() -> String {
     return userName._swiftObject
 }
 
+public func NSFullUserName() -> String {
+    NSUnimplemented()
+}
+
 internal func _NSCreateTemporaryFile(_ filePath: String) throws -> (Int32, String) {
     let template = "." + filePath + ".tmp.XXXXXX"
     let maxLength = Int(PATH_MAX) + 1

Foundation/ProcessInfo.swift

@@ -140,4 +140,12 @@ open class ProcessInfo: NSObject {
     open var systemUptime: TimeInterval {
         return CFGetSystemUptime()
     }
+    
+    open var userName: String {
+        return NSUserName()
+    }
+    
+    open var fullUserName: String {
+        return NSFullUserName()
+    }
 }