[main] Add images to documentation (Polprzewodnikowy#193)

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## Description
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Adds some images to documentation.

## Motivation and Context
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issue here -->
Improves look of website and shows others the way forward.

## How Has This Been Tested?
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## Screenshots
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## Types of changes
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the boxes that apply: -->
- [ ] Improvement (non-breaking change that adds a new feature)
- [ ] Bug fix (fixes an issue)
- [ ] Breaking change (breaking change)
- [x] Documentation Improvement
- [ ] Config and build (change in the configuration and build system,
has no impact on code or features)

## Checklist:
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that apply. -->
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- [ ] My code follows the code style of this project.
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly.
- [ ] I have added tests to cover my changes.
- [ ] All new and existing tests passed.

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Signed-off-by: GITHUB_USER <GITHUB_USER_EMAIL>

Author: networkfusion

README.md

@@ -5,7 +5,8 @@
 [![#yourfirstpr](https://img.shields.io/badge/first--timers--only-friendly-blue.svg)](https://github.com/Polprzewodnikowy/N64FlashcartMenu/CONTRIBUTING.md)
 
 # N64 Flashcart Menu
-An open source menu for N64 flashcarts.
+An open source menu for N64 flashcarts.  
+![N64FlashcartMenu menu information](./docs/images/menu-information.png)
 
 ## Supported Flashcarts
 This menu aims to support as many N64 flashcarts as possible.
@@ -121,6 +122,8 @@ These can be updated using the settings editor, but if required, you can also ma
 * Ensure the cart has the latest [firmware](https://github.com/Polprzewodnikowy/SummerCart64/releases/latest) installed.
 * Download the latest `sc64menu.n64` file from the [releases](https://github.com/Polprzewodnikowy/N64FlashcartMenu/releases/) page, then put it in the root directory of your SD card.
 
+![SC64 flashcart information](./docs/images/sc64-flashcart-information.png)
+
 
 ### 64drive
 * Ensure the cart has the latest [firmware](https://64drive.retroactive.be/support.php) installed.

docs/01_menu_controls.md

@@ -6,9 +6,10 @@
 Press either the `C-Up` or `C-Down` buttons to scroll by pages, rather than by elements.
 
 #### N64FlashcartMenu settings
-Press the `START` button on the browser screen to open the Settings window. From here you can edit some of the N64FlashcartMenu settings, 
-see information about either the console, the flashcart you are using or N64FlashcartMenu itself, and if your cart has Real-Time Clock (RTC) support, 
-you can also change its date and time.
+Press the `START` button on the browser screen to open the Settings window.  
+![Browser context menu](./images/main-context-menu.png)  
+From here you can edit some of the N64FlashcartMenu settings, 
+see information about either the console, the flashcart you are using or N64FlashcartMenu itself, and if your cart has Real-Time Clock (RTC) support, you can also change its date and time.
 
 #### Browser options
 Press the `R` button to open the Browser Options window. Here you can see a ROM's properties, delete it from your SD card or establish the default folder