Created Keyboard navigation (markdown)

Keyboard-navigation.md

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+The [desktop Linux version](https://github.com/koreader/koreader/wiki/Installation-on-desktop-Linux) of KOReader implements keyboard shortcuts for navigating the user interface and reading books.
+
+## Reading mode
+| Key  | Action |
+|---|----------------------------|
+| Left/Right | Next/prev page    | 
+| PgUp/PgDown | Next/prev page   |
+| Up/Down | Next/prev page       |
+| Enter | Open bottom menu       |
+| F1 | Open top menu             |
+| Esc | Back/exit application    |
+
+
+## File browser mode
+| Key  | Action |
+|---|----------------------------|
+| Up/Down | Navigate file list                |
+| Enter | Open selected book                |
+| Right | Show selected book's context menu         | 
+| F1 | Open top menu             |
+| Esc | Exit application    |