Adds banners and robot showcase (#7253)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Resources/Textures/Structures/Decoration/banner.rsi/meta.json

@@ -0,0 +1,44 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "https://github.com/tgstation/tgstation/commit/fa9e44d937026d5a2ba72615afccf2f18a87c485",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "banner"
+    },
+    {
+      "name": "banner-red"
+    },
+    {
+      "name": "banner-blue"
+    },
+    {
+      "name": "banner-yellow"
+    },
+    {
+      "name": "banner-green"
+    },
+    {
+      "name": "banner_engineering"
+    },
+    {
+      "name": "banner_medical"
+    },
+    {
+      "name": "banner_science"
+    },
+    {
+      "name": "banner_cargo"
+    },
+    {
+      "name": "banner_security"
+    },
+    {
+      "name": "banner_revolution"
+    }
+  ]
+}