Adding env.example file and env unity plugin

AR/.env.example

@@ -0,0 +1,3 @@
+API_URL=https://helloworld.com
+API_USER=hello
+API_PASSWORD=world

AR/.gitignore

@@ -142,3 +142,6 @@ PackageBackups/
 
 # UWP builds
 /UWP/*
+
+
+.env

AR/Packages/manifest.json

@@ -16,6 +16,7 @@
     "com.unity.xr.management": "4.2.0",
     "com.unity.xr.mock-hmd": "1.3.1-preview.1",
     "com.unity.xr.openxr": "1.6.0",
+    "xyz.candycoded.env": "https://github.com/CandyCoded/env.git",
     "com.unity.modules.ai": "1.0.0",
     "com.unity.modules.androidjni": "1.0.0",
     "com.unity.modules.animation": "1.0.0",

AR/Packages/packages-lock.json

@@ -297,6 +297,13 @@
       },
       "url": "https://packages.unity.com"
     },
+    "xyz.candycoded.env": {
+      "version": "https://github.com/CandyCoded/env.git",
+      "depth": 0,
+      "source": "git",
+      "dependencies": {},
+      "hash": "aefda8e07418cb6b9671284ba667cc690655792a"
+    },
     "com.unity.modules.ai": {
       "version": "1.0.0",
       "depth": 0,