✨ Add with-dotenv linking the built-in support

Author: GuiDevloper

examples/with-dotenv/README.md

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+# `dotenv` Example
+
+Nullstack automatically supports Environment Variable loading since v0.10.4 and Named Environments since v0.14.4. There's no need to manually set them up ✨
+
+Visit the [Environment Variables Example](../environment-variables) to see it on action.