Add Cocoapods

@@ -98,7 +98,7 @@
     
     
     UIBezierPath *progressline = [UIBezierPath bezierPath];
     UIBezierPath *progressline = [UIBezierPath bezierPath];
     
     
-    CGFloat firstValue = [_yValues[0] floatValue];
+    CGFloat firstValue = [[_yValues objectAtIndex:0] floatValue];
     
     
     CGFloat xPosition = (xLabelMargin + _xLabelWidth)   ;
     CGFloat xPosition = (xLabelMargin + _xLabelWidth)   ;
     
     

@@ -15,9 +15,21 @@ PNChart works on iOS 6.0 and later version and is compatible with ARC projects.
 
 
 You will need LLVM 3.0 or later in order to build PNChart.
 You will need LLVM 3.0 or later in order to build PNChart.
 
 
+
+
+
 ## Usage
 ## Usage
 
 
-Copy the PNChart folder to your project
+### Cocoapods
+
+[CocoaPods](http://cocoapods.org) is the recommended way to add PNChart to your project.
+
+1. Add a pod entry for PNChart to your Podfile `pod 'PNChart', '~> 0.1.5'`
+2. Install the pod(s) by running `pod install`.
+3. Include PNChart wherever you need it with `#import "PNChart.h"`.
+
+
+### Copy the PNChart folder to your project
 
 
 ```objective-c
 ```objective-c
   #import "PNChart.h"
   #import "PNChart.h"
@@ -42,3 +54,8 @@ Copy the PNChart folder to your project
 ## License
 ## License
 
 
 This code is distributed under the terms and conditions of the [MIT license](LICENSE).
 This code is distributed under the terms and conditions of the [MIT license](LICENSE).
+
+## SpecialThanks
+
+[@lexrus](http://twitter.com/lexrus)  CocoaPods Spec
+