Add table of contents (#270)

README.md

@@ -1,5 +1,16 @@
 # Embeddable Build Status Plugin
 
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+- [Query Parameters](#query-parameters)
+- [Parameter Resolver](#parameter-resolver)
+- [Pipeline (DSL)](#pipeline-dsl)
+- [Text variant](#text-variant)
+- [Extension points for plugin developers](#extension-points-for-plugin-developers)
+
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 This plugin provides customizable badges (similar to [shields.io](https://shields.io)) to any website.
 A [text variant](#text-variant) is also available that returns the build status as text.
 
@@ -122,6 +133,7 @@ This searches in the last `10` runs for the first successful build of the `maste
 Provide a link to be opened on clicking on the badge.
 
 ## Parameter Resolver
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 The query parameters `subject`, `status`, `color`, `animatedOverlayColor` and `link` support the usage of variables like `?subject=Build ${variable}`
 
 Available builtin variables are: