Added Gab Deck initial mvp

• Added:
- Gab Deck initial mvp

app/javascript/gabsocial/components/deck_column_header.js

@@ -0,0 +1,43 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import Icon from './icon'
+import Text from './text'
+import Button from './button'
+
+class DeckColumnHeader extends React.PureComponent {
+
+  render() {
+    const {
+      title,
+      subtitle,
+      icon,
+      children,
+    } = this.props
+
+    return (
+      <div className={[_s.d, _s.w100PC, _s.flexRow, _s.aiCenter, _s.h60PX, _s.px15, _s.py10, _s.borderBottom1PX, _s.borderColorSecondary, _s.bgPrimary].join(' ')}>
+        <Icon id={icon} className={_s.cPrimary} size='20px' />
+        <div className={[_s.d, _s.flexRow, _s.aiEnd, _s.ml15].join(' ')}>
+          <Text size='large' weight='medium'>{title}</Text>
+          { !!subtitle && <Text className={_s.ml5} size='small' color='secondary'>{subtitle}</Text> }
+        </div>
+        <div className={[_s.d, _s.aiCenter, _s.mlAuto, _s.jcCenter].join(' ')}>
+          <Button
+            color='primary'
+            backgroundColor='none'
+            icon='list'
+          />
+        </div>
+      </div>
+    )
+  }
+
+}
+
+DeckColumnHeader.propTypes = {
+  title: PropTypes.string,
+  subtitle: PropTypes.string,
+  icon: PropTypes.string,
+}
+
+export default DeckColumnHeader