Added NewsItem component for Gab News

• Added:
- NewsItem component for Gab News

app/javascript/gabsocial/components/news_item.js

@@ -0,0 +1,60 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import ImmutablePureComponent from 'react-immutable-pure-component'
+import ImmutablePropTypes from 'react-immutable-proptypes'
+import { DEFAULT_REL } from '../constants'
+import Button from './button'
+import RelativeTimestamp from './relative_timestamp'
+import Text from './text'
+import Image from './image'
+
+class NewsItem extends ImmutablePureComponent {
+
+  render() {
+    const { news } = this.props
+
+    if (!news) return null
+
+    const title = news.get('title')
+    const url = news.get('url')
+
+    if (!title || !url) return null
+    
+    return (
+      <Button
+        noClasses
+        href={url}
+        target='_blank'
+        rel={DEFAULT_REL}
+        className={[_s.d, _s.bgPrimary, _s.radiusSmall, _s.mr15, _s.overflowHidden, _s.h260PX, _s.w330PX].join(' ')}
+      >
+        <Image
+          src={news.get('image')}
+          className={[_s.h100PC, _s.w100PC, _s.left0, _s.top0, _s.right0, _s.bottom0, _s.posAbs, _s.z1].join(' ')}
+        />
+        <div className={[_s.d, _s.newsBackground, _s.h100PC, _s.w100PC, _s.top0, _s.left0, _s.right0, _s.bottom0, _s.posAbs, _s.z2].join(' ')}>
+          <div className={[_s.d, _s.w100PC, _s.px15, _s.pb15, _s.left0, _s.right0, _s.bottom0, _s.posAbs, _s.z2].join(' ')}>
+            <Text color='white' size='large' weight='medium'>
+              {title}
+            </Text>
+            <div className={[_s.d, _s.flexRow, _s.mt5].join(' ')}>
+              <Text color='white' size='small' className={_s.mr5}>
+                <RelativeTimestamp timestamp={news.get('publish_date')} />
+              </Text>
+              <Text color='white' size='small'>
+                · Click to read
+              </Text>
+            </div>
+          </div>
+        </div>
+      </Button>
+    )
+  }
+
+}
+
+NewsItem.propTypes = {
+  news: ImmutablePropTypes.map,
+}
+
+export default NewsItem