Add README

README.md

@@ -1,4 +1,17 @@
-# C4
+# C4 Model Diagrams Repository
+
+Welcome to our repository, where we explore the capabilities of the C4 model
+through a series of diagrams created for testing and demonstration purposes.
+
+Visit the site: https://c4test.rtfd.io/.
+
+## Components
+
+- C4 Model: graphical notation technique for modelling the arquitecture of
+  software systems.
+- Sphinx: documentation generator.
+- PlantUML for Sphinx: integration with PlantUML.
+- ReadTheDocs: hosting and real-time building of our documentation.
 
 ## TODO