Add MarkdownShortcuts

frontend/scenes/MarkdownShortcuts/MarkdownShortcuts.js

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+// @flow
+import React from 'react';
+import styled from 'styled-components';
+import Key from 'components/Key';
+import Flex from 'components/Flex';
+import HelpText from 'components/HelpText';
+
+function MarkdownShortcuts() {
+  return (
+    <Flex column>
+      <HelpText>
+        Know a little markdown syntax? You
+        {"'"}
+        re going to love all of the markdown
+        shortcuts built right into the Atlas editor.
+      </HelpText>
+      <List>
+        <Keys><Key>#</Key> <Key>Space</Key></Keys>
+        <Label>Large header</Label>
+        <Keys><Key>##</Key> <Key>Space</Key></Keys>
+        <Label>Medium header</Label>
+        <Keys><Key>###</Key> <Key>Space</Key></Keys>
+        <Label>Small header</Label>
+
+        <Keys><Key>1.</Key> <Key>Space</Key></Keys>
+        <Label>Numbered list</Label>
+        <Keys><Key>-</Key> <Key>Space</Key></Keys>
+        <Label>Bulleted list</Label>
+        <Keys><Key>[ ]</Key> <Key>Space</Key></Keys>
+        <Label>Todo list</Label>
+        <Keys><Key>&gt;</Key> <Key>Space</Key></Keys>
+        <Label>Blockquote</Label>
+        <Keys><Key>---</Key></Keys>
+        <Label>Horizontal divider</Label>
+        <Keys><Key>{'```'}</Key></Keys>
+        <Label>Code block</Label>
+        <Keys>_italic_</Keys>
+        <Label>Italic</Label>
+        <Keys>**bold**</Keys>
+        <Label>Bold</Label>
+        <Keys>~~strikethrough~~</Keys>
+        <Label>Strikethrough</Label>
+        <Keys>{'`code`'}</Keys>
+        <Label>Inline code</Label>
+      </List>
+    </Flex>
+  );
+}
+
+const List = styled.dl`
+  width: 100%;
+  overflow: hidden;
+  padding: 0;
+  margin: 0
+`;
+
+const Keys = styled.dt`
+  float: left;
+  width: 25%;
+  padding: 0 0 4px;
+  margin: 0
+`;
+
+const Label = styled.dd`
+  float: left;
+  width: 75%;
+  padding: 0 0 4px;
+  margin: 0
+`;
+
+export default MarkdownShortcuts;

frontend/scenes/MarkdownShortcuts/index.js

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+// @flow
+import MarkdownShortcuts from './MarkdownShortcuts';
+export default MarkdownShortcuts;