Created the first initial pages

docs/en/tutorials/modular-crm/index.md

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+## Modular Monolith Application Development Tutorial
+
+ABP provides a great infrastructure and tooling to build modular software solutions. In this tutorial, you will learn how to create application modules, compose and communicate them to build a monolith modular web application.
+
+## Tutorial Outline
+
+This tutorial is organized as the following parts:
+
+* Part 1: Creating the solution
+
+## Download the Source Code
+
+*TODO*

docs/en/tutorials/modular-crm/part-01.md

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+## Modular Monolith Application Development Tutorial (Part 1: Creating the Solution)
+
+TODO