[New icon] .NET (#875)

* Create dot-net.svg

.NET icon - according to the guidelines.

* Rename dot-net.svg to dotnet.svg

Removed hyphen in filename.

* Adding metadata of .NET

Adding metadata of .NET

* Rename .NET SVG to match #888

* Optimize .NET using SVGO

Precision: 4
Lower values gave artifacts in e.g. corners of "N"

_data/simple-icons.json

@@ -1,5 +1,10 @@
 {
     "icons": [
+        {
+            "title": ".NET",
+            "hex": "5C2D91",
+            "source": "https://docs.microsoft.com/en-us/dotnet/images/hub/net.svg"
+        },
         {
             "title": "500px",
             "hex": "0099E5",

icons/dot-net.svg

@@ -0,0 +1 @@
+<svg aria-labelledby="simpleicons-dot-net-icon" role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title id="simpleicons-dot-net-icon">.NET icon</title><path d="M3.1672 7.5655v8.749H4.19v-6.325a8.979 8.979 0 0 0-.0488-1.1998h.0384a2.9082 2.9082 0 0 0 .2784.5473l4.4973 6.9774h1.2569V7.5655H9.1904v6.1526a9.2574 9.2574 0 0 0 .0619 1.286h-.0234c-.0544-.1056-.173-.3002-.3553-.585L4.4964 7.5656zm9.315 0v8.749h4.65l.0048-.9599h-3.6087v-3.0331h3.1579V11.4h-3.1579V8.4916h3.3884v-.926zm5.4374 0v.926h2.5149v7.823h1.0216v-7.823H24v-.926zM.6534 15.067a.643.643 0 0 0-.4565.2062A.6719.6719 0 0 0 0 15.753a.6623.6623 0 0 0 .1968.4799.6479.6479 0 0 0 .4799.2015.6623.6623 0 0 0 .4799-.2015.6575.6575 0 0 0 .2015-.48.667.667 0 0 0-.2015-.4798.6575.6575 0 0 0-.4799-.2062.643.643 0 0 0-.0234 0z"/></svg>