Update 1. Web Services.md

Added link to The Secret to Amazons Success Internal API article
Merge pull request #9 from sveinnel/patch-1

Update 1. Web Services.md
Removed SQL server files from gitignore
Added DB files to starter project
Fix reference

Add reference to System.ComponentModel.DataAnnotation
Merge pull request #10 from odinn-b/patch-1

Fix reference
Update 7. Unit of Work.md
Update 8. Dependency Injection.md
Update 8. Dependency Injection.md
Update 8. Dependency Injection.md
Update 9. LINQ.md
Update 9. LINQ.md
Update 9. LINQ.md
Update and rename Unit testing.md to 11. Unit testing.md
Create 10. Mapping.md
Rename 11. Unit testing.md to 12. Unit testing.md
Create 11. Entity relationships.md
Update 10. Mapping.md
Create Validation.md
Create Security.md