add README and solution file

ICSharpCode.AvalonEdit.sln

@@ -0,0 +1,26 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+# SharpDevelop 5.0
+VisualStudioVersion = 12.0.20827.3
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ICSharpCode.AvalonEdit", "ICSharpCode.AvalonEdit\ICSharpCode.AvalonEdit.csproj", "{6C55B776-26D4-4DB3-A6AB-87E783B2F3D1}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ICSharpCode.AvalonEdit.Tests", "ICSharpCode.AvalonEdit.Tests\ICSharpCode.AvalonEdit.Tests.csproj", "{6222A3A1-83CE-47A3-A4E4-A018F82D44D8}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6C55B776-26D4-4DB3-A6AB-87E783B2F3D1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6C55B776-26D4-4DB3-A6AB-87E783B2F3D1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6C55B776-26D4-4DB3-A6AB-87E783B2F3D1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6C55B776-26D4-4DB3-A6AB-87E783B2F3D1}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6222A3A1-83CE-47A3-A4E4-A018F82D44D8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6222A3A1-83CE-47A3-A4E4-A018F82D44D8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6222A3A1-83CE-47A3-A4E4-A018F82D44D8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6222A3A1-83CE-47A3-A4E4-A018F82D44D8}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

README.md

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+AvalonEdit
+==========
+
+AvalonEdit is the name of the new WPF-based text editor in SharpDevelop 4.x "Mirador".