ISSUE #123 adds aside component to main components

app/concepts/matestack/ui/core/aside/aside.haml

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+%aside{@tag_attributes}
+  - if block_given?
+    = yield

app/concepts/matestack/ui/core/aside/aside.rb

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+module Matestack::Ui::Core::Aside
+  class Aside < Matestack::Ui::Core::Component::Static
+
+  end
+end

docs/components/aside.md

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+# matestack core component: Aside
+
+Show [specs](/spec/usage/components/aside_spec.rb)
+
+The HTML `<aside>` tag implemented in ruby.
+
+## Parameters
+
+This component can take 2 optional configuration params and optional content.
+
+#### # id (optional)
+Expects a string with all ids the aside tag should have.
+
+#### # class (optional)
+Expects a string with all classes the aside tag should have.
+
+## Example 1
+
+```ruby
+aside id: "foo", class: "bar" do
+  paragraph text: "This is some text"
+end
+```
+
+returns
+
+```html
+<aside id="foo" class="bar">
+  <p>This is some text</p>
+</aside>
+```

spec/usage/components/aside_spec.rb

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+require_relative "../../support/utils"
+include Utils
+
+describe "Aside Component", type: :feature, js: true do
+  it "Example 1" do
+    class ExamplePage < Matestack::Ui::Page
+
+      def response
+        components {
+          #simple aside
+          aside
+
+          #simple aside with attributes
+          aside id: "my-id", class: "my-class"
+
+          #nested aside
+          aside do
+            paragraph text: "This is some text"
+          end
+        }
+      end
+
+    end
+
+    visit "/example"
+
+    static_output = page.html
+
+    expected_static_output = <<~HTML
+    <aside></aside>
+
+    <aside id="my-id" class="my-class"></aside>
+
+    <aside>
+      <p>This is some text</p>
+    </aside>
+    HTML
+
+    expect(stripped(static_output)).to include(stripped(expected_static_output))
+  end
+
+end
+
+