added shortcuts to the README

README.md

@@ -37,6 +37,32 @@ Usage: hextazy [file]
 hextazy ./test/all_bytes.bin
 ```
 
-You can edit the file directly. Please note that there is __no undo__ at the moment.
+You can edit the file directly. Please note that the file is __modified immediately without warning__.
 
-Once you're done, press __`q`__ to __exit__.
+Once you're done, press __`q`__ or __`Ctrl + C`__ to __exit__.
+
+## Shortcuts
+
+| Key Combination   | Action       |
+|-------------------|--------------|
+| `Ctrl + C`        | Exit the app. |
+| `Ctrl + Q`        | __Exit__ the app. |
+| `q`               | Exit the app (in _hex editor_ mode). |
+| `Ctrl + Z`        | __Undo__ the last write. |
+| `Ctrl + Y`        | __Redo__, cancel the last _undo_. |
+| `Ctrl + →`        | Jump 4 bytes to the right. |
+| `Ctrl + ←`        | Jump 4 bytes to the left. |
+| `:`               | Open the command bar. |
+| `:q`              | Exit the app. |
+| `/`               | Open the search bar. |
+
+### Search
+
+| Key Combination   | Action       |
+|-------------------|--------------|
+| `/4142`           | Search the hex value `0x4142`, and the ascii string `"4142"`. |
+| `n`               | Go to the next search result. |
+| `Shift + n`       | Go to the previous search result. |
+| `:s/abc`          | Search the _string_ `"acb"`. |
+| `:x/4142`         | Search the hex value `0x4142`. |
+| `:xi/4142`        | Search the hex value in reverse order: `0x4241`. |