Add README to docs

Author: IsabelParedes

docs/README.md

@@ -0,0 +1,23 @@
+# Emscripten-Forge Documentation
+
+Follow the instructions below to build the documentation locally.
+
+1. Install `pixi` in your environment.
+
+    ```bash
+    micromamba install pixi -c conda-forge
+    ```
+
+2. Build the documentation.
+
+    ```bash
+    pixi run docs-build -d _build
+
+    ```
+
+3. The generated documentation can be found in the `_build` directory. Use your favorite server.
+
+    ```bash
+    cd _build
+    python -m http.server
+    ```