add manifest file

3DParts/RatchetWheel/okh-RatchetWheel.json

+  {
+    "okhv": "2.0",
+    "repo": "https://gitlab.com/OSEGermany/ohloom",
+    "version": "1.0.0",
+    "spdx-license": "CC-BY-SA-4.0",
+    "licensor": "Jens Meisner",
+    "image": "Documentation/Assembly_Guide/Parts_Print_1.jpg",
+    "documentation-language": "en-GB",
+    "tscd-id": "COM-MAN",
+    "production-metadata": [
+    	"3D printed",
+    	"PLA",
+    	"cylinder(h=45, r=??)
+    	],
+    "source": "/3DParts/RatchetWheel/RatchetWheel.scad",
+    "export": [
+    "/3DParts/RatchetWheel/RatchetWheel.pdf",
+    "/3DParts/RatchetWheel/RatchetWheel.stl"
+    ],
+  }