Add Otp.NET licensing info

Duplicati/License/Duplicati.License.csproj

@@ -70,6 +70,15 @@
       <Link>licenses\gpg\License.txt</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="..\..\thirdparty\Otp.NET\Homepage.txt">
+      <Link>licenses\Otp.NET\Homepage.txt</Link>
+    </Content>
+    <Content Include="..\..\thirdparty\Otp.NET\license.txt">
+      <Link>licenses\Otp.NET\license.txt</Link>
+    </Content>
+    <Content Include="..\..\thirdparty\Otp.NET\licensedata.json">
+      <Link>licenses\Otp.NET\licensedata.json</Link>
+    </Content>
     <Content Include="..\..\thirdparty\SharpCompress\download.txt">
       <Link>licenses\SharpCompress\download.txt</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>

thirdparty/Otp.NET/Homepage.txt

@@ -0,0 +1 @@
+https://github.com/kspearrin/Otp.NET

thirdparty/Otp.NET/license.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 Kyle Spearrin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

thirdparty/Otp.NET/licensedata.json

@@ -0,0 +1,7 @@
+{
+    "name": "Otp.NET",
+    "description": "An implementation TOTP RFC 6238 and HOTP RFC 4226 in C#.",
+    "link": "https://github.com/kspearrin/Otp.NET",
+    "license": "MIT",
+    "notes": ""
+}