add gog screenshots to docs

docs/players/Heroes_Chronicles.md

@@ -4,6 +4,11 @@ It also possible to play the Heroes Chronicles with VCMI. You still need a compl
 
 You also need Heroes Chronicles from [gog.com](https://www.gog.com/en/game/heroes_chronicles_all_chapters). You need to download the offline installer. CD installations are not supported yet.
 
+gog.com download page:
+![GoG-Installer-Chr](images/gog_offline_installer_chr.png)
+
+For each chapter you will need a seperate exe file to install (if you want to install all, you'll need 8 exe files).
+
 You can use the "Install file" button in the launcher to select the downloaded exe files. This process can take a while (especially on mobile platforms) and need some temporary free space.
 
 After that you can select Heroes Chronicles from Campaign selection menu (button or custom campaign).

docs/players/Installation_Android.md

@@ -15,6 +15,9 @@ Installation is a two step process, at first you need to install game, then you
 - Connect your device to PC and enable file transfer.
 - Copy "Data", "Maps" and "Mp3" from Heroes III to any folder on  mobile device, then open VCMI, select Heroes III data import option, then select the folder where you copied Heroes III data.
 
+gog.com download page:
+![GoG-Installer](images/gog_offline_installer.png)
+
 ## Troubleshooting / known issues
 
 ### The game crashes on start

docs/players/Installation_Linux.md

@@ -111,10 +111,13 @@ flatpak run --command=vcmibuilder eu.vcmi.VCMI --data /path/to/h3/data`
 
 ### Install data using gog.com offline installer
 
-Download both files for the "offline backup game installers" and extract them using innoextract tool
+Download both files for the "offline backup game installers" and extract them using innoextract tool.
 
 You can select both downloaded files in launcher to extract automatically.
 
+gog.com download page:
+![GoG-Installer](images/gog_offline_installer.png)
+
 Alternatively you can use the classic way:
 
 ```sh

docs/players/Installation_iOS.md

@@ -23,6 +23,9 @@ iii) To install the .ipa file on your device do one of the following:
 
 If you bought HoMM3 on [GOG](https://www.gog.com/de/game/heroes_of_might_and_magic_3_complete_edition), you can download the files directly from the browser in the device.
 
+gog.com download page:
+![GoG-Installer](images/gog_offline_installer.png)
+
 Launch VCMI app on the device and the launcher will prompt two files to complete the installation. Select the **.bin** file first, then the **.exe** file. This may take a few seconds. Please be patient.
 
 ## Step 3: Configuration settings

docs/players/Installation_macOS.md

@@ -19,6 +19,9 @@ Please report about gameplay problem on forums: [Help & Bugs](https://forum.vcmi
 
 If you bought HoMM3 on [GOG](https://www.gog.com/de/game/heroes_of_might_and_magic_3_complete_edition), you can download the files directly from the browser and install them in the launcher. Select the .bin file first, then the .exe file. This may take a few seconds. Please be patient.
 
+gog.com download page:
+![GoG-Installer](images/gog_offline_installer.png)
+
 ### Step 2.b: Installing by the classic way
 
 1. Find a way to unpack Windows Heroes III or GOG installer. For example, use `vcmibuilder` script inside app bundle or install the game with [CrossOver](https://www.codeweavers.com/crossover) or [Kegworks](https://github.com/Kegworks-App/Kegworks).