Create launcher_config_guide.md

Docs/launcher_config_guide.md

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+Here is a complete guide on how to customise the launcher.
+
+## 1. Find the "launcher_config.txt" file
+   This is where you will be able to customise it
+
+   **Windows**: Should be in the same folder as the launcher
+
+   **MacOS / Linux**: Should be in `~/.dsda-doom`
+
+## 2. Structure of this file
+
+   It is divided in 3 parts
+
+   1 - Toggles
+
+   2 - Bottom row type
+
+   3 - Bottom row boxes
+
+## 3. Customise the Toggles
+
+   ![Screenshot 2021-09-09 at 19 06 58](https://user-images.githubusercontent.com/82064173/132739358-140ab152-9dbe-4280-8727-88fcfe07a486.jpg)
+
+   The 4 toggles in the image above are the default and are defined by:
+   ```
+   "Fast Monsters" "-fast"
+   "No Monsters" "-nomonsters"
+   "Respawn Monsters" "-respawn"
+   "Solo Net" "-solo-net"
+   ```
+
+   "Text that appears in the launcher" "Parameter"
+
+## 4. Change the Bottom Row Type
+
+   1 = The bottom row can either be the default "Fullscreen + Resolution" boxes
+
+   or
+
+   2 = You can customise the contents of 2 different boxes
+
+   Change the number that appears to 2 if you want to customise it. Leave it as 1 to stay with the "Fullscreen + Resolution"
+
+## 5. Customise the Bottom Row (Only if you chose 2)
+
+   ```
++"Time"
+"-time_use"
+"-time_keys"
+"-time_secrets"
+"-time_all"
+
++"Stats"
+"-levelstat"
+"-analysis"
+"both"
+   ```
+
+   ___
+
+   +"Text on top of the boxes"
+
+   "Parameter"
+
+   "Another Parameters"
+
+   "etc"
+
+   ___
+
+   If the last option is "both" or "all", then it will use every parameter in that drop down menu			
+
+   ex: -levelstat -analysis	
+
+
+# Messed up?
+
+ If you messed up and can't get it to work, note that deleting the file will make the launcher reset it to default when restarting the launcher