Documentation (#90)

* added docs for custom fields and resources

* Added docs for routes and views

docs/custom_fields.md

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+## Custom Fields
+You can generate a custom field with:
+
+rails g madmin:field Custom
+This will create a CustomField class in app/madmin/fields/custom_field.rb And the related views:
+
+# -> app/views/madmin/fields/custom_field/_form.html.erb
+# -> app/views/madmin/fields/custom_field/_index.html.erb
+# -> app/views/madmin/fields/custom_field/_show.html.erb
+You can then use this field on our resource:
+
+class PostResource < Madmin::Resource
+  attribute :title, field: CustomField
+end

docs/resources.md

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+# Resources
+Madmin uses Resource classes to add models to the admin area.
+
+## Generate a Resource
+To generate a resource for a model, you can run:
+
+rails g madmin:resource ActionText::RichText

docs/routes.md

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+# Routes
+Routes should be under the namespace of madmin module.Like
+namespace :madmin do
+	namespace :user do
+	  resources :connected_accounts
+	end	
+  end

docs/views.md

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+# Configuring Views
+The views packaged within the gem are a great starting point, but inevitably people will need to be able to customize those views.
+
+You can use the included generator to create the appropriate view files, which can then be customized.
+
+For example, running the following will copy over all of the views into your application that will be used for every resource:
+
+rails generate madmin:views