Add basic version of post show page

app/javascript/components/Post/PostP.tsx

@@ -0,0 +1,62 @@
+import * as React from 'react';
+
+import IPost from '../../interfaces/IPost';
+import IPostStatus from '../../interfaces/IPostStatus';
+
+import PostStatusSelect from './PostStatusSelect';
+
+interface Props {
+  postId: number;
+  post: IPost;
+  postStatuses: Array<IPostStatus>;
+  isLoggedIn: boolean;
+  isPowerUser: boolean;
+  authenticityToken: string;
+
+  requestPost(postId: number): void;
+  changePostStatus(
+    postId: number,
+    newPostStatusId: number,
+    authenticityToken: string,
+  ): void;
+}
+
+class PostP extends React.Component<Props> {
+  componentDidMount() {
+    this.props.requestPost(this.props.postId);
+  }
+
+  render() {
+    const {
+      post,
+      postStatuses,
+
+      isPowerUser,
+      authenticityToken,
+
+      changePostStatus,
+    } = this.props;
+
+    return (
+      <div>
+        <h1>{post.title}</h1>
+        {
+          isPowerUser ?
+            <PostStatusSelect
+              postStatuses={postStatuses}
+              selectedPostStatusId={post.postStatusId}
+              handleChange={
+                newPostStatusId => changePostStatus(post.id, newPostStatusId, authenticityToken)
+              }
+            />
+          :
+            <span>LLL</span>
+        }
+
+        <p>{post.description}</p>
+      </div>
+    );
+  }
+}
+
+export default PostP;