Add file/folder icons for MongoDB (#256)

* Add icons for mongo

* Fix file extension

* Transfer icon from fileName to fileExtension

* Clean up

---------

Co-authored-by: Miguel Solorio <miguel.solorio07@gmail.com>

src/symbol-icon-theme.json

@@ -55,6 +55,7 @@
 		"folder-middleware": { "iconPath": "./icons/folders/folder-middleware.svg" },
 		"folder-models": { "iconPath": "./icons/folders/folder-models.svg" },
 		"folder-modules": { "iconPath": "./icons/folders/folder-modules.svg" },
+		"folder-mongo": { "iconPath": "./icons/folders/folder-mongo.svg" },
 		"folder-pipes": { "iconPath": "./icons/folders/folder-pipes.svg" },
 		"folder-prisma": { "iconPath": "./icons/folders/folder-prisma.svg" },
 		"folder-providers": { "iconPath": "./icons/folders/folder-providers.svg" },
@@ -186,6 +187,7 @@
 		"markdown": { "iconPath": "./icons/files/markdown.svg" },
 		"mdx": { "iconPath": "./icons/files/mdx.svg" },
 		"minecraft": { "iconPath": "./icons/files/minecraft.svg" },
+		"mongo": { "iconPath": "./icons/files/mongo.svg" },
 		"nest-controller": { "iconPath": "./icons/files/nest-controller.svg" },
 		"nest-service": { "iconPath": "./icons/files/nest-service.svg" },
 		"nest-guard": { "iconPath": "./icons/files/nest-guard.svg" },
@@ -295,6 +297,7 @@
 		"mcstructure": "minecraft",
 		"mcpack": "minecraft",
 		"mcaddon": "minecraft",
+		"mongodb": "mongo",
 		"lang": "i18n",
 		"mo": "i18n",
 		"po": "i18n",
@@ -1513,6 +1516,8 @@
 		"mailers": "folder-mail",
 		"image": "folder-images",
 		"images": "folder-images",
+		"mongo": "folder-mongo",
+		"mongodb": "folder-mongo",
 		"hooks": "folder-hooks",
 		"constants": "folder-constants"
 	},