feat: openAPI docs for total-supply endpoint

docs/api/info/get-total-stx-supply.example.json

@@ -0,0 +1,6 @@
+{
+  "unlocked_percent": "71.99",
+  "total_stx": "1352464600.000000",
+  "unlocked_stx": "973705260.219817",
+  "block_height": 3210
+}

docs/api/info/get-total-stx-supply.schema.json

@@ -0,0 +1,26 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "description": "GET request that returns network target block times",
+  "title": "GetTotalStxSupplyResponse",
+  "type": "object",
+  "additionalProperties": false,
+  "required": ["unlocked_percent", "total_stx", "unlocked_stx", "block_height"],
+  "properties": {
+    "unlocked_percent": {
+      "type": "string",
+      "description": "String quoted decimal number of the percentage of STX that have unlocked"
+    },
+    "total_stx": {
+      "type": "string",
+      "description": "String quoted decimal number of the total possible number of STX"
+    },
+    "unlocked_stx": {
+      "type": "string",
+      "description": "String quoted decimal number of the STX that have been mined or unlocked"
+    },
+    "block_height": {
+      "type": "integer",
+      "description": "The block height at which this information was queried"
+    }
+  }
+}