Updated the nuget readmes.

Sagara.Core.sln

@@ -6,6 +6,7 @@ MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{F754F120-7D0E-48B5-B57B-E8F92F15FE4A}"
 	ProjectSection(SolutionItems) = preProject
 		.editorconfig = .editorconfig
+		DefaultDocumentation.json = DefaultDocumentation.json
 		Directory.Build.props = Directory.Build.props
 		global.json = global.json
 		nuget.config = nuget.config

src/Sagara.Core.Caching/README.md

@@ -1,3 +1,5 @@
 # Sagara.Core.Caching
 
-TODO: elaborate
+Common caching code that I use across many projects.
+
+See the [GitHub repo](https://github.com/jonsagara/Sagara.Core) for documentation.

src/Sagara.Core.Logging.Serilog/README.md

@@ -1,3 +1,5 @@
 # Sagara.Core.Logging.Serilog
 
-TODO: elaborate
+Common Serilog logging code that I use across many projects.
+
+See the [GitHub repo](https://github.com/jonsagara/Sagara.Core) for documentation.

src/Sagara.Core/README.md

@@ -1,3 +1,5 @@
 # Sagara.Core
 
-TODO: elaborate
+Common code that I use across many projects.
+
+See the [GitHub repo](https://github.com/jonsagara/Sagara.Core) for documentation.