add documentation for setting up an api key

docs/index.rst

@@ -17,6 +17,7 @@
   :caption: The Basics
 
   overview/get_started.rst
+  overview/api_key.rst
   demos/quickstart.ipynb
 
 

docs/overview/api_key.rst

@@ -0,0 +1,18 @@
+Setting up your API key
+=======================
+
+You can generate a personal api key for Ivy by signing up for free at https://ivy.dev/signin.
+This will grant you additional transpilations that can be used for completely free on any code! Find out more at https://ivy.dev/.
+
+Using your API key
+------------------
+
+There are two ways to use your api key in your local environment. The easiest is to export it as the IVY_KEY environment variable, like so:
+
+.. code-block:: bash
+
+    export IVY_KEY=<my_key>
+
+The other way is to create a 'ivy-key.pem' file in your local directory, containing just your api key. Ivy should automatically detect this file and use your key.
+
+If you run into any problems with your api key, feel free to raise an issue at https://github.com/ivy-llc/ivy/issues, or get in touch at [email protected].