docs: create .all-contributorsrc

.all-contributorsrc

@@ -0,0 +1,24 @@
+{
+  "projectName": "colouring-london",
+  "projectOwner": "tomalrussell",
+  "repoType": "github",
+  "repoHost": "https://github.com",
+  "files": [
+    "README.md"
+  ],
+  "imageSize": 100,
+  "commit": false,
+  "contributors": [
+    {
+      "login": "dominijk",
+      "name": "dominic",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/6041913?v=4",
+      "profile": "https://dghumphrey.co.uk/",
+      "contributions": [
+        "ideas",
+        "content"
+      ]
+    }
+  ],
+  "contributorsPerLine": 7
+}