Update help, add screenshot

Author: igrek51

README.md

@@ -10,6 +10,8 @@
     <a href="https://docs.rs/crate/fpick/">docs.rs</a>
 </div>
 
+![](./docs/img/screenshot1.png)
+
 ## Installation
 ### Cargo
 ```sh
@@ -30,22 +32,21 @@ Launch the interactive file picker by running `fpick`.
 
 Navigate with keyboard:
 
-- Up & Down to move between files and directories,
-- Left to go up,
-- Right to enter a directory.
-- Type in the phrase of a filename to filter the list of files
-- Enter to select a file, exit and print its path to stdout.
+- `↑` and `↓` to move between files and directories,
+- `→` to enter a directory.
+- `←` to go up,
+- Type a phrase to filter the list of files
+- `Enter` to select a file, exit and print its path to stdout.
 
 ## Examples
 You can use it in combination with other commands, for example to print the selected file:
 ```sh
 cat `fpick`
 ```
 
-Tired of typing `ls` and `cd ...`, over and over again,
+Tired of typing `ls` and `cd`, over and over again,
 just to find a file in a deeply nested directory tree?
-Use `fpick` to navigate through directories interactively.
-
+Use `fpick` to navigate through directories interactively:
 ```sh
 cd `fpick`
 ```

docs/img/screenshot1.png

@@ -18,10 +18,10 @@ impl App {
                 std::process::exit(0);
             } else if last == "--help" {
                 println!("fpick - interactive file picker. Usage:");
-                println!("fpick - to select a file in a current directory and return its path");
-                println!("fpick <path> - to select a file starting from a specified directory");
-                println!("fpick --version - to print version");
-                println!("fpick --help - to print usage");
+                println!("  `fpick` to select a file in a current directory and return its path");
+                println!("  `fpick <path>` to select a file starting from a specified directory");
+                println!("  `fpick --version` to print version");
+                println!("  `fpick --help` to print usage");
                 std::process::exit(0);
             } else {
                 self.starting_dir = trim_end_slash(last.to_string());