Add Japanese te-oku page.

src/Pages/Japan/Japanese/en/te-oku.md

@@ -0,0 +1,35 @@
+## ておく
+
+---
+
+* て-form + おく
+* て-form + おきます
+* て-form + おいて
+
+1. To prepare or do in advance.
+2. To leave as is, without doing anything.
+
+---
+
+#### 1. To prepare or do in advance.
+
+* 来年、北海道に行くから、<Furigana kanji="旅館" kana="りょかん"/>を<Furigana kanji="予約" kana="よやく"/>し<Jps colour="c1" text="ておきます"/>。
+* I will book a hotel <Jps colour="c1" text="in advance"/>, because I am going to Hokkaido next year.
+
+* 来週、パーティーに行くから、<Furigana kanji="髪" kana="かみ"/>を切っ<Jps colour="c1" text="ておきます"/>。
+* I will get a haircut <Jps colour="c1" text="in advance"/>, because I will go to the party next week.
+
+* 来週の試験のため、漢字を勉強し<Jps colour="c1" text="ておきました"/>。
+* I studied kanji <Jps colour="c1" text="in preparation"/> for the exam next week.
+
+#### 2. To leave as is, without doing anything.
+
+* お姉さんには<Furigana kanji="内緒" kana="ないしょ"/>にし<Jps colour="c1" text="ておく"/>ね。
+* I <Jps colour="c1" text="will keep"/> it a secret with my older sister.
+
+
+---
+
+###### 関係する動画
+
+* [【JLPT N4 Grammar】〜ておく](https://www.youtube.com/watch?v=_fm1CiLbXZ4) by: [Japanese Shoko](https://www.youtube.com/@UKjapanese369)

src/Pages/Japan/en/main.md

@@ -14,6 +14,10 @@ These pages contain my notes on learning the language.
 * [と、たら、ば、なら](./japanese/if-when)
 * [けど、けれど、けれども、のに](./japanese/but)
 
+### て-forms
+
+* [ておく](./japanese/te-oku)
+
 ### Particles (助詞、じょし)
 
 * [Particles](./japanese/particles)

src/Routers.js

@@ -9,7 +9,7 @@ import ElmPage from './Pages/Software/elm/ElmPage';
 
 // Japan
 export const japaneseRoutes = languages.map(lang => {
-    const pages = ['but', 'cheat-sheet', 'contrast-particle', 'dake-vs-shika', 'if-when', 'particles', 'tameni-youni-noni', 'toka-tari-shi', 'verbs'];
+    const pages = ['but', 'cheat-sheet', 'contrast-particle', 'dake-vs-shika', 'if-when', 'particles', 'tameni-youni-noni', 'te-oku', 'toka-tari-shi', 'verbs'];
     return pages.map(page => {
       const path = `/${lang}/japan/japanese/${page}`;
       const mdPath = `Japan/Japanese/${lang}/${page}.md`;