Create README.md

README.md

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+---
+tags:
+- mermaid
+---
+
+
+```mermaid
+graph TD;
+    A-->B;
+    A-->C;
+    B-->D;
+    C-->D;
+```
+
+```geojson
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "id": 1,
+      "properties": {
+        "ID": 0
+      },
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+              [-90,35],
+              [-90,30],
+              [-85,30],
+              [-85,35],
+              [-90,35]
+          ]
+        ]
+      }
+    }
+  ]
+}
+```