Add fa-matrix-org (fixes #118)

Matrix is an open protocol for real-time communication. It is designed
to allow users with accounts at one communications service provider to
communicate with users of a different service provider via online chat,
Voice over IP, and Videotelephony

src/icons/icons.yml

@@ -7086,3 +7086,15 @@ icons:
     url:        inkscape.org
     categories:
       - Brand Icons
+
+  - name:       Matrix.org
+    id:         matrix-org
+    unicode:    f313
+    created:    1.1
+    url:        matrix.org
+    filter:
+      - chat
+      - federation
+      - message
+    categories:
+      - Brand Icons

src/icons/svg/matrix-org.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1536" height="1792" viewBox="0 0 1536 1792">
+    <g stroke-width=".409">
+        <path d="M33.512 289.11v1213.78h87.328V1532H0V260h120.84v29.11zM406.795 673.89v61.398h1.713c16.389-23.483 36.203-41.585 59.197-54.305 22.993-12.965 49.657-19.325 79.5-19.325 28.62 0 54.793 5.627 78.521 16.634 23.728 11.008 41.585 30.822 54.06 58.708 13.454-19.814 31.8-37.426 54.794-52.592 22.994-15.166 50.39-22.75 81.946-22.75 23.973 0 46.233 2.936 66.78 8.807 20.548 5.87 37.916 15.166 52.593 28.13 14.676 12.965 25.929 29.599 34.246 50.391 8.072 20.792 12.23 45.743 12.23 75.097v303.568H857.866V870.56c0-15.166-.489-29.598-1.712-43.052-1.223-13.454-4.403-25.196-9.54-34.98-5.382-10.03-12.965-17.857-23.239-23.728-10.273-5.87-24.216-8.806-41.584-8.806-17.612 0-31.8 3.424-42.563 10.03-10.763 6.848-19.325 15.41-25.44 26.418-6.116 10.763-10.274 22.993-12.231 36.936-1.957 13.699-3.18 27.642-3.18 41.585v252.688h-124.51v-254.4c0-13.454-.244-26.663-.978-39.873-.489-13.209-3.18-25.195-7.583-36.447-4.403-11.008-11.741-20.059-22.015-26.663-10.274-6.605-25.196-10.03-45.254-10.03-5.87 0-13.699 1.224-23.239 3.914-9.54 2.691-19.08 7.583-28.13 14.922-9.051 7.338-16.879 17.857-23.239 31.555-6.36 13.699-9.54 31.8-9.54 54.06v263.206H289.38V673.89zM1238.488 1502.89V289.11h-87.328V260H1272v1272h-120.84v-29.11z"/>
+    </g>
+</svg>