feat: Add ButtplugUnity directory

When CI builds, it should copy DLLs for the core and websocket client
into Runtime, zip the directory, and keep it as an artifact.

ButtplugUnity/.gitignore

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+*.meta

ButtplugUnity/LICENSE.md

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+Copyright (c) 2020, Nonpolynomial Labs, LLC
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of buttplug nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

ButtplugUnity/README.md

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+# Buttplug Unity
+
+Unity Package for Buttplug support in Unity 2019.1+.
+
+Only the following classes should be used:
+
+- ButtplugClient
+- ButtplugWebsocketConnector
+
+Trying to use an embedded connector will fail as no
+DeviceSubtypeManagers are distributed with this package (UWP doesn't
+play well with Unity, so you wouldn't get Bluetooth anyways). It is
+expected that anything built with this will either connect to
+[Intiface Desktop](https://github.com/intiface/intiface-desktop) or
+[Intiface CLI](https://github.com/intiface/intiface-cli-csharp).
+
+Future releases will contain the Intiface CLI executable and will work
+as a standalone.
+
+## Installation
+
+- [Download latest zip from releases section](https://github.com/buttplugio/buttplug-unity/releases)
+- Unzip somewhere
+- In Unity Project Frame, right click "Assets" > "Import Package" > "Custom Package"
+- Choose package.json from buttplug-unity.
+- Start using Buttplug classes in your scripts

ButtplugUnity/Runtime/.keep

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+Null file to make sure directory stays in git

ButtplugUnity/package.json

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+{
+  "name": "com.nonpolynomial.buttplug-unity",
+  "version": "0.5.8",
+  "displayName": "Buttplug Unity",
+  "description": "Buttplug for Unity",
+  "unity": "2019.1"
+}