添加tsundoku的读音说明

Author: Peter Qin

02.proof-of-work.ipynb

@@ -18,7 +18,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "日语里有个很好玩的词，“**積ん読**”（[tsundoku](https://en.wikipedia.org/wiki/Tsundoku)）：\n",
+    "日语里有个很好玩的词，“**積ん読**”（[tsundoku 读作：森多谷](https://en.wikipedia.org/wiki/Tsundoku)）：\n",
     "\n",
     "> 指那些买回来堆在那里还没读过的（甚至后来干脆不看了的）书……\n",
     "\n",