Move English documentation to folder en_US

doc/en_US/creating-projects.markdown

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+Creating Projects
+=================
+
+Kanboard can handle multiple projects. There are two kinds of projects:
+
+- Team projects
+- Private project for a single user
+
+Creating projects for multiple users
+-------------------------------------
+
+- Only administrators and project administrators can create those projects
+- User management is available
+
+From the dashboard, click on the link **New project**:
+
+![Project creation form](screenshots/new-project.png)
+
+It's very easy: you just have to find a name for your project!
+
+Creating a private project
+--------------------------
+
+- Anybody can create a private project
+- There is **NO** user management
+- Only the owner and administrators can access the project
+
+From the dashboard, click on the link **New private project**.
+
+Creating projects from another project
+--------------------------------------
+
+When you create a new project, you can choose to duplicate the properties of another project:
+
+- Permissions
+- Actions
+- Swimlanes
+- Categories
+- Tasks