[Sprite] Diagonal walls (#15973)

Resources/Textures/Structures/Walls/solid_diagonal.rsi/meta.json

@@ -0,0 +1,17 @@
+{
+    "version": 1,
+    "size": {
+        "x": 32,
+        "y": 32
+    },
+    "license": "CC-BY-SA-3.0",
+    "copyright": "Sprited by PuroSlavKing (Github) for Space Station 14",
+    "states": [
+        {
+            "name": "state0"
+        },
+        {
+            "name": "state1"
+        }
+    ]
+}