Implemented issue create modal, further polish

client/src/Project/IssueDetails/Dates/Styles.js

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+import styled from 'styled-components';
+
+import { color, font } from 'shared/utils/styles';
+
+export const Dates = styled.div`
+  margin-top: 11px;
+  padding-top: 13px;
+  line-height: 22px;
+  border-top: 1px solid ${color.borderLightest};
+  color: ${color.textMedium};
+  ${font.size(13)}
+`;

client/src/Project/IssueDetails/Dates/index.jsx

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+import React from 'react';
+import PropTypes from 'prop-types';
+
+import { formatDateTimeConversational } from 'shared/utils/dateTime';
+import { Dates } from './Styles';
+
+const propTypes = {
+  issue: PropTypes.object.isRequired,
+};
+
+const ProjectBoardIssueDetailsDates = ({ issue }) => (
+  <Dates>
+    <div>Created at {formatDateTimeConversational(issue.createdAt)}</div>
+    <div>Updated at {formatDateTimeConversational(issue.updatedAt)}</div>
+  </Dates>
+);
+
+ProjectBoardIssueDetailsDates.propTypes = propTypes;
+
+export default ProjectBoardIssueDetailsDates;