Create README.md

README.md

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+# CSP Header Generator
+
+A small and simple library to help generate rules for CSP (Content-Security-Policy) headers.
+Quick features:
+* Enum for most common directive names
+* Constants for some of the common values
+* Can add your own directives, should the enum be incomplete
+* Methods for quickly adding the ones used by Google Tag Manager and analytics ([Used this as reference](https://developers.google.com/tag-manager/web/csp))
+
+## Example usage
+```C#
+CSPHeaderBuilder headerBuilder = new CSPHeaderBuilder(CSPHeaderBuilder.StaticValues.None);
+headerBuilder.AddDirective(CSPHeaderBuilder.DirectiveType.Font, CSPHeaderBuilder.StaticValues.Self);
+headerBuilder.AddDirective(CSPHeaderBuilder.DirectiveType.Img, CSPHeaderBuilder.StaticValues.Self);
+headerBuilder.AddDirective(CSPHeaderBuilder.DirectiveType.Img, CSPHeaderBuilder.StaticValues.SchemaData);
+headerBuilder.AddDirective(CSPHeaderBuilder.DirectiveType.Style, CSPHeaderBuilder.StaticValues.Self);
+headerBuilder.AddGoogleTagManager();
+
+Response.AddHeader("Content-Security-Policy", headerBuilder.ToString());
+```