Adding .gitignore

Adding .gitignore based on visual studio file types. also removing
Blackbaud.AppFx.SpWrap as the project should reference the version on
the web server
Adding Blackbaud.OpenFx.Reporting

Adding Blackbaud.OpenFx.Reporting sample that contains the following
samples:
1. Sustained Giving Dashboard
2. Top Donors Report
3. Selected Constituents Report
Adding Blackbaud.OpenFx.ODataSample

Adding Blackbaud.OpenFx.ODataSample project and also update ReadMe.md to
include more details
Merge pull request #1 from Blackbaud-RonFrum/master

Adding .gitignore and updating readme.md. also adding Blackbaud.OpenFx.Reporting and Blackbaud.OpenFx.ODataSample projects