Add format:map-generator command (#2563)

I'd like to submit some PRs in the future to add additional options for
logging and debugging to the map-generator, however I don't want to
introduce any code style changes in feature requests.

## Description:

I noticed there was not any style guide or formatting being done for the
go files, and went with the simplest built-in approach w/ [go
fmt](https://go.dev/blog/gofmt)

- Adds a `format:map-generator` npm command that will run the default
`go fmt` in the `map-generator` directory to format the go code.
- Runs the formatter and commits the changes to `main.go` and
`map_generator.go`
- Updates the `map-generator` README:
  - Updated location for generated files
  - Updated Links to use markdown links
  - Add `info.json` example
  - Add in-game enabling instructions with list of files to modify
  - Add development tools section with format command

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

tidwell

map-generator/README.md

@@ -10,24 +10,59 @@ This is a tool to generate map files for OpenFront.
 
 ## Creating a new map
 
-1. Create a new folder in assets/maps/<map_name>
+1. Create a new folder in `assets/maps/<map_name>`
 2. Create image.png
 3. Create info.json with name and countries
 4. Add the map name in main.go
 5. Run the generator: `go run .`
-6. Find the output folder at generated/maps/<map_name>
+6. Find the output folder at `../resources/maps/<map_name>`
 
 ## Create image.png
 
-1. Download world map (warning very large file) https://drive.google.com/file/d/1W2oMPj1L5zWRyPhh8LfmnY3_kve-FBR2/view?usp=sharing
-2. Crop the file (recommend Gimp), we recommend roughly 2 million pixels for performance reasons. Do not go over 4 million pixels.
+1. [Download world map (warning very large file)](https://drive.google.com/file/d/1W2oMPj1L5zWRyPhh8LfmnY3_kve-FBR2/view?usp=sharing)
+2. Crop the file (recommend Gimp)
+
+- We recommend roughly 2 million pixels for performance reasons
+- Do not go over 4 million pixels.
 
 ## Create info.json
 
 - Look at existing info.json for structure
-- Use country codes found here: https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes
+- [Use country codes found here](https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes)
+
+Example:
+
+```json
+{
+  "name": "MySampleMap",
+  "nations": [
+    {
+      "coordinates": [396, 364],
+      "name": "United States",
+      "strength": 3,
+      "flag": "us"
+    }
+  ]
+}
+```
+
+## To Enable In-Game
+
+- Add a translation for the map name to `resources/lang/en.json`
+- Add the MapDescription `src/client/components/Maps.ts`
+- Add the numPlayersConfig `src/core/configuration/DefaultConfig.ts`
+- Add the GameMapType `src/core/game/Game.ts`
+- To add to the map playlist, modify `src/server/MapPlaylist.ts`
 
 ## Notes
 
 - Islands smaller than 30 tiles (pixels) are automatically removed by the script.
 - Bodies of water smaller than 200 tiles (pixels) are also removed.
+
+## 🛠️ Development Tools
+
+- **Format map-generator code**:
+
+  ```bash
+  go fmt .
+  ```