Updated git ignore and added packaging process

Author: grofit

.gitignore

@@ -4,3 +4,4 @@ packages/
 .idea/
 *.user
 *.suo
+*.nupkg

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 LP
+
+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.

build/nuget.exe

@@ -0,0 +1 @@
+nuget pack ../src/ecsrx/package.nuspec

build/pack.bat

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<package xmlns="http://schemas.microsoft.com/packaging/2013/05/nuspec.xsd">
+  <metadata>    
+    <id>ecsrx</id>
+    <version>0.1.0</version>
+    <title>EcsRx</title>
+    <authors>grofit</authors>
+    <owners>grofit</owners>
+    <licenseUrl>https://github.com/grofit/ecsrx/blob/master/LICENSE</licenseUrl>
+    <projectUrl>https://github.com/grofit/ecsrx</projectUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>A reactive take on the ECS pattern for .net game developers</description>
+    <summary>A reactive take on the ECS pattern for .net game developers</summary>
+    <releaseNotes>Initial release</releaseNotes>
+    <tags>ecs rx reactive patterns ioc game-development xna monogame unity</tags>
+    <dependencies>
+      <dependency id="System.Reactive.Core" version="4.0" />
+      <dependency id="System.Reactive.Linq" version="4.0" />
+    </dependencies>
+  </metadata>
+  <files>
+    <file src="bin\Release\netstandard2.0\EcsRx.dll" target="lib/netstandard2.0" />
+    <file src="../../readme.md" target="" />
+  </files>
+</package>