Initial IsolatedStorage implementation

Implements most of the APIs we intend to provide. Still pending are:

- Size methods
- Remove methods

We do not plan to implement the store iterator or any factory methods
that take arguments yet.

Tests are forthcoming- the helper class is intended to facilitate unit
testing as well as abstracting platform differences.

src/System.IO.IsolatedStorage/System.IO.IsolatedStorage.sln

@@ -0,0 +1,56 @@
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+	ProjectSection(SolutionItems) = preProject
+		pkg\System.IO.IsolatedStorage.builds = pkg\System.IO.IsolatedStorage.builds
+		pkg\System.IO.IsolatedStorage.pkgproj = pkg\System.IO.IsolatedStorage.pkgproj
+	EndProjectSection
+EndProject
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+		{FAF5D1E4-BA43-4663-8429-C069066D75CB}.Windows_Debug|Any CPU.Build.0 = Windows_Debug|Any CPU
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src/System.IO.IsolatedStorage/ref/4.0.2/System.IO.IsolatedStorage.depproj

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+  <PropertyGroup>
+    <AssemblyVersion>4.0.2.0</AssemblyVersion>
+    <OutputType>Library</OutputType>
+    <PackageTargetFramework>netstandard1.3</PackageTargetFramework>
+    <NuGetTargetMoniker>.NETStandard,Version=v1.3</NuGetTargetMoniker>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Include="project.json" />
+  </ItemGroup>
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
+</Project>

src/System.IO.IsolatedStorage/ref/4.0.2/project.json

@@ -0,0 +1,15 @@
+{
+  "dependencies": {
+    "System.IO": "4.0.0",
+    "System.IO.FileSystem.Primitives": "4.0.0",
+    "System.Runtime": "4.0.0",
+    "System.Threading.Tasks": "4.0.0"
+  },
+  "frameworks": {
+    "netstandard1.4": {
+      "imports": [
+        "dotnet5.5"
+      ]
+    }
+  }
+}