Add banner to README

Author: IsabelParedes

README.md

@@ -1,4 +1,7 @@
-#  Emscripten forge
+<img src="docs/assets/banner.svg" alt="Emscripten-forge Banner" style="width: 80%;">
+
+#
+
 [![CI](https://img.shields.io/badge/emscripten_forge-docs-yellow)](https://emscripten-forge.org)
 [![CI](https://img.shields.io/badge/emscripten_forge-blog-pink)](https://emscripten-forge.org/blog/)