Rearrage dir and add Xamarin files

.gitignore

@@ -74,3 +74,4 @@ $RECYCLE.BIN/
 
 bin
 obj
+Reference

Crossings.sln

@@ -0,0 +1,17 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Crossings", "Crossings\Crossings.csproj", "{33F25716-3123-45CD-99E8-C3CDB0164930}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{33F25716-3123-45CD-99E8-C3CDB0164930}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{33F25716-3123-45CD-99E8-C3CDB0164930}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{33F25716-3123-45CD-99E8-C3CDB0164930}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{33F25716-3123-45CD-99E8-C3CDB0164930}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

Crossings.userprefs

@@ -0,0 +1,36 @@
+<Properties StartupItem="Crossings\Crossings.csproj">
+  <MonoDevelop.Ide.Workspace ActiveConfiguration="Debug" />
+  <MonoDevelop.Ide.Workbench ActiveDocument="Crossings\TODO.txt">
+    <Files>
+      <File FileName="Crossings\Crossings.cs" Line="65" Column="23" />
+      <File FileName="Crossings\CrossingsUIToggle.cs" Line="170" Column="60" />
+      <File FileName="Crossings\Detours.cs" Line="70" Column="10" />
+      <File FileName="Crossings\CrossingTool.cs" Line="43" Column="5" />
+      <File FileName="Crossings\CrossingsNode.cs" Line="257" Column="61" />
+      <File FileName="Crossings\TODO.txt" Line="10" Column="1" />
+      <File FileName="Crossings\UIUtils.cs" Line="22" Column="2" />
+    </Files>
+    <Pads>
+      <Pad Id="ProjectPad">
+        <State expanded="True">
+          <Node name="Crossings" expanded="True">
+            <Node name="Properties" expanded="True" />
+            <Node name="TODO.txt" selected="True" />
+          </Node>
+        </State>
+      </Pad>
+      <Pad Id="ClassPad">
+        <State expanded="True" selected="True">
+          <Node name="Crossings" expanded="True">
+            <Node name="References" expanded="True" />
+            <Node name="Crossings" expanded="True" />
+          </Node>
+        </State>
+      </Pad>
+    </Pads>
+  </MonoDevelop.Ide.Workbench>
+  <MonoDevelop.Ide.DebuggingService.Breakpoints>
+    <BreakpointStore />
+  </MonoDevelop.Ide.DebuggingService.Breakpoints>
+  <MonoDevelop.Ide.DebuggingService.PinnedWatches />
+</Properties>