Created Chinese keyboard (markdown)

Chinese-keyboard.md

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+Chinese version: [笔画输入法](https://github.com/koreader/koreader/wiki/笔画输入法)
+
+Starting from version 2022-10 (to be released), KOReader integrates the Chinese stroke keyboard for inputting simplified and traditional Chinese characters.
+
+### Choosing keyboard
+Long press the global key on other keyboard or choose 中文(zh) from Settings->Device->Keyboard->Keyboard layouts then single tap the global key to switch to Chinese keyboard.
+
+### Input method
+The stroke input method groups character strokes into five categories. Then any character is typed by its stroke order.
+| Key | Stroke type |
+| ------ | ------ |
+| `一` | Horizontal or rising stroke |
+| `丨` | Vertical or vertical with hook |
+| `丿` | Falling left |
+| `丶` | Dot or falling right |
+| `𠃋` | Turning |
+
+For example, to input 大, keys `一丿丶` are used.
+
+Note all turning strokes are input with a single `𠃋` key as long as they are written in one go. So 马 is input with `𠃋𠃋一`.
+
+After getting the intended character, a `分隔`(Separate) or `空格`(Space) key should be used to finish the input. Otherwise, strokes of the next character will be appended to that of the current one thus changing the character.
+
+Besides, the keyboard layout contains a wildcard key `*` to use in place of any uncertain stroke.
+
+Swipe north on the `分隔`(Separate) key for quick deletion of unfinished strokes.
+
+### Character candidates
+When two or more characters share the same stroke composition, the `下一字`(Next character) key is used to iterate them.
+
+The character 〇 is input by key `𠃋` + `下一字`.
+
+To turn off showing candidates in the input box, go to Settings->Device->Keyboard->Layout-specific keyboard settings. the `下一字`(Next character) key is still used to change character when candidates exist.
+
+### Punctuation marks
+Commonly used punctuation marks can be input from the `，` and `。` keys. Long press on them to reveal more marks. Swipe to specific directions on them to input corresponding marks.
+
+Mark "、" is input by swiping north the `丶` key, mark "——" the `一` key.
+
+More marks can be input from the number pad by tapping `123` key or by switching to other keyboards.