XSGD is a Singapore Dollar backed stablecoin (#5323)

* XSGD is a Singapore Dollar backed stablecoin

It was launched by xfers in October 2020 (https://www.xfers.com/sg/stablecoin) and is currently being traded on many exchanged as seen below:

Liquid Exchange: https://app.liquid.com/exchange/XSGDSGD
Tokenize Exchange: https://tokenize.exchange/store/detail/XSGD
Coinut: https://coinut.com/spot/USDTXSGD 
Uniswap: https://info.uniswap.org/pair/0x80fd21ff4a1ff7727fb81e098c5062ba47fe67af
Zilswap: https://zilswap.io/swap
Xanpool: https://xanpool.com/ 
Sparrow Exchange
Crypto.com
QCP Capital

* Add files via upload

* Move logo.png to checksum-format folder; remove small image

* Json formatting

Co-authored-by: Catenocrypt <catenocrypt@users.noreply.github.com>

blockchains/ethereum/assets/0x70e8dE73cE538DA2bEEd35d14187F6959a8ecA96/info.json

@@ -3,8 +3,20 @@
     "symbol": "XSGD",
     "type": "ERC20",
     "decimals": 6,
-    "description": "-",
-    "website": "",
+    "description": "XSGD is the fully collateralized Singapore Dollar stablecoin, powered by open-source blockchain protocols. All Xfers issued SGD-backed stablecoins have 1:1 parity with Singapore Dollar. On our platform, your Digital Goods Wallet balance is denominated in SGD. You may credit or debit this balance in the form of XSGD or SGD.",
+    "website": "https://www.xfers.com/sg/stablecoin",
     "explorer": "https://etherscan.io/token/0x70e8dE73cE538DA2bEEd35d14187F6959a8ecA96",
+    "socials": [
+        {
+            "name": "Twitter",
+            "url": "https://twitter.com/xfers?lang=en",
+            "handle": "xfers"
+        },
+        {
+            "name": "Facebook",
+            "url": "https://www.facebook.com/Xfers/",
+            "handle": "Xfers"
+        }
+    ],
     "id": "0x70e8dE73cE538DA2bEEd35d14187F6959a8ecA96"
 }