Update README key bindings

README.md

@@ -25,8 +25,12 @@ Key | Action
 `hjkl` (or `← ↓ ↑→ `) | Scroll one row or column in the given direction
 `Ctrl + f` (or `Page Down`) | Scroll one window down
 `Ctrl + b` (or `Page Up`) | Scroll one window up
-`Ctrl + h` (or `Ctrl + ←`) | Scroll one window left
-`Ctrl + l` (or `Ctrl + →`) | Scroll one window right
+`Ctrl + d` (or `d`) | Scroll half a window down
+`Ctrl + u` (or `u`) | Scroll half a window up
+`Ctrl + h` | Scroll one window left
+`Ctrl + l` | Scroll one window right
+`Ctrl + ←` | Scroll left to first column
+`Ctrl + →` | Scroll right to last column
 `G` (or `End`) | Go to bottom
 `g` (or `Home`) | Go to top
 `<n>G` | Go to line `n`
@@ -38,6 +42,7 @@ Key | Action
 `TAB` | Toggle between row, column or cell selection modes
 `Enter` (in Cell mode) | Print the selected cell to stdout and exit
 `-S` | Toggle line wrapping
+`H` | Display help
 `q` | Exit
 
 ### Optional parameters

src/help.rs

@@ -9,15 +9,19 @@ use tui::{
 const HELP_CONTENT: &str = "
 csvlens is an interactive CSV file viewer in the command line.
 
-You are viewing its help page. Press q to exit.
+These are the key bindings. Press q to exit.
 
 # Moving
 
 hjkl (or ← ↓ ↑→ )       : Scroll one row or column in the given direction
 Ctrl + f (or Page Down) : Scroll one window down
 Ctrl + b (or Page Up)   : Scroll one window up
-Ctrl + h (or Ctrl + ←)  : Scroll one window left
-Ctrl + l (or Ctrl + →)  : Scroll one window right
+Ctrl + d (or d)         : Scroll half a window down
+Ctrl + u (or u)         : Scroll half a window up
+Ctrl + h                : Scroll one window left
+Ctrl + l                : Scroll one window right
+Ctrl + ←                : Scroll left to first column
+Ctrl + →                : Scroll right to last column
 G (or End)              : Go to bottom
 g (or Home)             : Go to top
 <n>G                    : Go to line n