Add playground as better example

Author: vincentneo

Example/CoreGPX.xcodeproj/project.pbxproj

@@ -50,6 +50,7 @@
 		B1FA67C144CC465C6B228AB8 /* GPXKit.podspec */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text; name = GPXKit.podspec; path = ../GPXKit.podspec; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.ruby; };
 		BF67E9292217F2EE008B6202 /* GPXTest-TrackPointOnly.gpx */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xml; path = "GPXTest-TrackPointOnly.gpx"; sourceTree = "<group>"; };
 		BF693E5022C8A69A00CBCE5A /* CoreGPX.podspec */ = {isa = PBXFileReference; explicitFileType = text.script.ruby; fileEncoding = 4; name = CoreGPX.podspec; path = ../CoreGPX.podspec; sourceTree = "<group>"; };
+		BF693E5422C8E71B00CBCE5A /* CoreGPX Playground.playground */ = {isa = PBXFileReference; lastKnownFileType = file.playground; path = "CoreGPX Playground.playground"; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.swift; };
 		BF7F905C21F7501800359484 /* CreationViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CreationViewController.swift; sourceTree = "<group>"; };
 		BFD4523C21E9F17A002ECA3A /* ParseViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ParseViewController.swift; sourceTree = "<group>"; };
 		E4C0F7E2E749B02F23048D43 /* README.md */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = net.daringfireball.markdown; name = README.md; path = ../README.md; sourceTree = "<group>"; };
@@ -100,6 +101,7 @@
 		607FACD21AFB9204008FA782 /* Example for CoreGPX */ = {
 			isa = PBXGroup;
 			children = (
+				BF693E5422C8E71B00CBCE5A /* CoreGPX Playground.playground */,
 				607FACD51AFB9204008FA782 /* AppDelegate.swift */,
 				607FACD71AFB9204008FA782 /* ViewController.swift */,
 				BF7F905C21F7501800359484 /* CreationViewController.swift */,

Example/GPXKit/CoreGPX Playground.playground/Contents.swift

@@ -0,0 +1,34 @@
+import Foundation
+import CoreGPX
+
+// Example: Generate GPX string
+
+let root = GPXRoot(creator: "CoreGPX Playground")
+
+let track = GPXTrack()
+let firstSegment = GPXTrackSegment()
+
+let metadata = GPXMetadata()
+
+metadata.time = Date()
+metadata.copyright = GPXCopyright(author: "Vincent Neo")
+metadata.desc = "This GPX File is created to facilitate the understanding of CoreGPX library's usage!"
+
+root.metadata = metadata
+
+let firstTrkPt = GPXTrackPoint(latitude: 1.2345, longitude: 2.3456)
+firstTrkPt.elevation = 31.92492
+firstTrkPt.extensions = GPXExtensions()
+firstTrkPt.extensions!["customproperties"] = ["Location" : "Sembawang, Singapore", "CompassDegree" : "120"]
+
+let secondTrkPt = GPXTrackPoint(latitude: 0.294, longitude: 38.019)
+
+firstSegment.add(trackpoint: firstTrkPt)
+firstSegment.add(trackpoint: secondTrkPt)
+
+track.add(trackSegment: firstSegment)
+
+root.add(track: track)
+
+print(root.gpx())
+

Example/GPXKit/CoreGPX Playground.playground/contents.xcplayground

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios' executeOnSourceChanges='false'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>