According to the request of nuget.org, add license and project statement.

NOTICE.TXT

@@ -0,0 +1,181 @@
+dotnetcore/NPOI is a downstream project of the tonyqus/NPOI project, which is licensed under the Apache 2.0 license and available at: https://github.com/nissl-lab/npoi
+
+----------------------------------------------
+
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
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+distribution as defined by Sections 1 through 9 of this document.
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build/version.props

@@ -2,7 +2,7 @@
 	<PropertyGroup>
 		<VersionMajor>1</VersionMajor>
 		<VersionMinor>2</VersionMinor>
-		<VersionPatch>2</VersionPatch>
+		<VersionPatch>3</VersionPatch>
 		<VersionQuality></VersionQuality>
 		<VersionPrefix>$(VersionMajor).$(VersionMinor).$(VersionPatch)</VersionPrefix>
 	</PropertyGroup>

src/NPOI.OOXML/NPOI.OOXML.csproj

@@ -11,4 +11,11 @@
 		<ProjectReference Include="..\NPOI\NPOI.csproj" />
 	</ItemGroup>
 
+	<ItemGroup>
+		<Content Include="../../NOTICE.TXT">
+			<PackageCopyToOutput>true</PackageCopyToOutput>
+			<Pack>true</Pack>
+		</Content>
+	</ItemGroup>
+
 </Project>