[Docs] - Global environment variables (#1885)

Document adding a global variable to a project.

Question - what does the generic/credential value control?

docs/docs/administration/global-env.mdx

@@ -0,0 +1,43 @@
+import ZoomableImage from "/src/theme/ZoomableImage.js";
+import Admonition from "@theme/Admonition";
+
+# Global environment variables
+
+Langflow 1.0 alpha includes the option to add **Global Environment Variables** for your application.
+
+## Add a global variable to a project
+
+In this example, you'll add the `openai_api_key` credential as a global environment variable to the **Basic Prompting** starter project.
+
+For more information on the starter flow, see [Basic prompting ](../starter-projects/basic-prompting.mdx).
+
+1. From the Langflow dashboard, click **New Project**.
+2. Select **Basic Prompting**.
+3. The **Basic Prompting** flow is created.
+4. To create an environment variable for the **OpenAI** component, in the **OpenAI API Key** field, click the **Globe** button, and then click **Add New Variable**.
+
+<Admonition type="tip">
+  You can also create global variables in **Settings** > **Variables and Secrets**.
+</Admonition>
+
+    1. In the **Variable Name** field, enter `openai_api_key`.
+    2. In the **Value** field, paste your OpenAI API Key (`sk-...`).
+    3. For the variable **Type**, select **Credential**.
+    4. In the **Apply to Fields** field, select **OpenAI API Key** to apply this variable to all fields named **OpenAI API Key**.
+    5. Click **Save Variable**.
+
+<ZoomableImage
+  alt="Docusaurus themed image"
+  sources={{
+    light: "img/global-env.png",
+    dark: "img/global-env.png",
+  }}
+  style={{ width: "40%", margin: "20px auto" }}
+/>
+
+You now have a `openai_api_key` global environment variable for your Langflow project.
+
+5. To view and manage your project's global environment variables, visit **Settings** > **Variables and Secrets**.
+
+For more on variables in HuggingFace Spaces, see [Managing Secrets](https://huggingface.co/docs/hub/spaces-overview#managing-secrets).
+

docs/sidebars.js

@@ -40,6 +40,7 @@ module.exports = {
         "administration/login",
         "administration/api",
         "administration/cli",
+        "administration/global-env",
         "administration/components",
         "administration/collection",
         "administration/prompt-customization",