Feature: markdown (#132)

* [#131]Feat: headerParser&emphasisParser

* chore: markdown preview 제거

fe/src/components/common/Markdown.tsx

@@ -0,0 +1,67 @@
+import styled from 'styled-components';
+
+const Markdown = ({ string }: { string: string }) => {
+  const checkHeader = (str: string) => {
+    const check = str.match(/^[\#]+ |^[\>] /gi);
+    if (check)
+      return { key: check[0], str: str.replace(/^[\#]+ |^[\>] /gi, '') };
+    else return { key: null, str: str };
+  };
+
+  const headerParser = (key: string | null, str: string | JSX.Element) => {
+    switch (key) {
+      case '# ':
+        return <h1>{str}</h1>;
+      case '## ':
+        return <h2>{str}</h2>;
+      case '### ':
+        return <h3>{str}</h3>;
+      case '#### ':
+        return <h4>{str}</h4>;
+      case '##### ':
+        return <h5>{str}</h5>;
+      case '###### ':
+        return <h6>{str}</h6>;
+      case '> ':
+        return <QuotationStyle>{str}</QuotationStyle>;
+      case null:
+        return <span>{str}</span>;
+    }
+  };
+
+  const emphasisParser = (str: string) => {
+    const arr = str.match(/(\*{2,5})(.*?)\1/g);
+    let res = [];
+    let temp;
+    if (!arr) return str;
+    else {
+      temp = arr.map((str) => <b>{str.slice(2, -2)}</b>);
+    }
+    let sp  = str.replace(/(\*{2,5})(.*?)\1/g, '\n').split('\n');
+    let j =0;
+  for(let i =0; i<sp.length; i++) {
+    if(!sp[i].length){
+      res.push(temp[j])
+      j++
+    } else res.push(sp[i])
+  }
+    return <>{res.map((v) => v)}</>;
+  };
+
+  return (
+    <>
+      {string
+        .split('\n')
+        .map((v) => headerParser(checkHeader(v).key, emphasisParser(checkHeader(v).str)))}
+    </>
+  );
+};
+
+export default Markdown;
+
+const QuotationStyle = styled.div`
+  border-left: 4px solid #39a6a3;
+  background-color: #deedf0;
+  width: 100%;
+  padding: 1rem;
+`;

fe/src/components/new-issue/NewIssueLeft.tsx

@@ -7,6 +7,7 @@ import CommentTextarea from 'components/common/CommentTextarea';
 import IssueTitleInput from 'components/common/IssueTitleInput';
 
 import { newIssuesContentAtom } from 'stores/issueStore';
+import Markdown from 'components/common/Markdown';
 
 const NewIssueLeft = () => {
   const [newIssuesContent, setNewIssuesContent] =