Added code block (#20)

docs/encyclopedia/lumen-supply-metrics.mdx

@@ -2,6 +2,8 @@
 title: Lumen Supply Metrics 
 ---
 
+import { CodeExample } from "@site/src/components/CodeExample"
+
 This section explains how lumen supply metrics are calculated and made available via API. This information can be useful for products and services that track the distribution of XLM, including market cap aggregators and some exchanges, or to anyone who wants to investigate the distribution of XLM defined by the SDF mandate.
 
 Unlike many other blockchains, the native network currency is not created through mining- all XLM that has ever existed and will ever exist was created when the Stellar network went live.
@@ -11,7 +13,24 @@ Unlike many other blockchains, the native network currency is not created throug
 ## Dashboard API
 As of December 12, 2019, the Dashboard API shows:
 
-[insert code]
+<CodeExample>
+
+```json
+{
+  "updatedAt": "2019-12-12T21:07:23.480Z",
+  "originalSupply": "100000000000",
+  "inflationLumens": "5443902087.3472865",
+  "burnedLumens": "55442098181.3755700",
+  "totalSupply": "50001803905.9717165",
+  "upgradeReserve": "414310437.8111675",
+  "feePool": "1807341.5766261",
+  "sdfMandate": "29635032570.5297368",
+  "circulatingSupply": "19950653556.0541861",
+  "_details": "https://www.stellar.org/developers/guides/lumen-supply-metrics.html"
+}
+```
+
+</CodeExample>
 
 ## Definitions
 **originalSupply**