Added project management intro

Docs/introduction.md

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+# Introduction
+
+The **ProjectManagement** module is for managing projects.
+
+## Target Group
+
+The target group for this module are organizations that need to manage projects and maintain the associated information in a structured form. 
+
+# Setup
+
+The module can be installed through the integrated module downloader and installer or by uploading the module into the `Modules/` directory and executing the installation through the module installer. 
+
+# Features
+
+## Scheduling
+
+The module allows to schedule events in a calender for the project. It's easy to see when which events such as meetings for this project take place.
+
+## Milestones & Tasks
+
+It's possible to define milestones and assign tasks to them. This allows to generate a milestone overview (Gantt Chart) with dependencies to keep track of the project progression. By using tasks everyone can see who is responsible for which todos. 
+
+## Budgeting
+
+Cost and Return can be managed in the project as well in order to keep track of these.
+
+## Media
+
+Often media files are associated with projects which can be managed as well.
+
+## Emails
+
+Emails and internal conversations can be assigned to projects either privately or publicly.
+
+# Recommendation
+
+Other modules that work great with this one together are:
+
+* [Tasks](Tasks)
+* [Calendar](Calendar)
+* [Media](Media)
+* [Messages](Messages)
+* [Charts](Charts)