add a monochrome version of the logo

branding/README.md

@@ -22,6 +22,7 @@ Various versions are available for different purposes, as shown in the table bel
 | ---- | ----- | ----- |
 | <img src="./logo/forgejo.svg" alt="" width="100" /> | [SVG](./logo/forgejo.svg), [PNG](./logo/forgejo.png) | Standard version of the logo.
 | <img src="./logo/forgejo-padded.svg" alt="" width="100" /> | [SVG](./logo/forgejo-padded.svg), [PNG](./logo/forgejo-padded.png) | Padded version which can be cropped to a circle, for social media avatars etc.
+| <img src="./logo/forgejo-monochrome.svg" alt="" width="100" /> | [SVG](./logo/forgejo-monochrome.svg), [PNG&nbsp;(black)](./logo/forgejo-black.png), [PNG&nbsp;(white)](./logo/forgejo-white.png) | Monochrome version of the logo. SVG version uses `currentColor` to inherit the current text colour.
 | <img src="./logo/forgejo-animated.svg" alt="" width="100" /> | [SVG](./logo/forgejo-animated.svg), [PNG](./logo/forgejo-animated.png) | Animated version, used as a loading animation in the Forgejo UI.
 
 The logo was created by [Caesar Schinas](https://caesarschinas.com/) and is licensed under the

branding/logo/forgejo-monochrome.svg

@@ -0,0 +1,37 @@
+<svg viewBox="0 0 212 212" xmlns="http://www.w3.org/2000/svg">
+  <metadata
+    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+    xmlns:cc="http://creativecommons.org/ns#"
+    xmlns:dc="http://purl.org/dc/elements/1.1/"
+  >
+    <rdf:RDF>
+      <cc:Work rdf:about="https://codeberg.org/forgejo/meta/src/branch/readme/branding#logo">
+        <dc:title>Forgejo logo</dc:title>
+        <cc:creator rdf:resource="https://caesarschinas.com/"><cc:attributionName>Caesar Schinas</cc:attributionName></cc:creator>
+        <cc:license rdf:resource="http://creativecommons.org/licenses/by-sa/4.0/" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <style type="text/css">
+    :root, svg {
+      color-scheme: dark light;
+    }
+    circle {
+      fill: none;
+      stroke: white;
+      stroke-width: 15;
+    }
+    path {
+      fill: none;
+      stroke: white;
+      stroke-width: 25;
+    }
+  </style>
+  <g transform="translate(6,6)">
+    <path d="M58 168 v-98 a50 50 0 0 1 50-50 h20" />
+    <path d="M58 168 v-30 a50 50 0 0 1 50-50 h20" />
+    <circle cx="142" cy="20" r="18" />
+    <circle cx="142" cy="88" r="18" />
+    <circle cx="58" cy="180" r="18" />
+  </g>
+</svg>