Update appium-dotnet-driver.nuspec

update release notes
Fixed #48 (GetScreenshot method missing)
Merge pull request #49 from edgy360/screenshot

Fix #48 (GetScreenshot method missing)
Added StartActivity method and tests.  Corrected package references to Newtonsoft.Json and Selenium.Webdriver.
Normalized line ending settings to Windows.
Merge pull request #54 from 0x1mason/2969

Added StartActivity method and tests.
Update appium-dotnet-driver.csproj

updated location of projects
Update samples.csproj

updated location of nuget packages
Update README.md

update version number
Update RELEASE_NOTES.md
Update RELEASE_NOTES.md