Add info and logo for Moonriver and Moonbeam (#20876)

* Add info for Moonbeam and Moonriver

blockchains/moonbeam/info/info.json

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+{
+    "name": "Moonbeam",
+    "website": "https://moonbeam.network",
+    "description": "Moonbeam combines the best of both worlds: the familiar and easy-to-use tooling of Ethereum and the scalable, interoperable architecture of Polkadot.",
+    "explorer": "https://moonscan.io",
+    "research": "",
+    "symbol": "GLMR",
+    "type": "coin",
+    "decimals": 18,
+    "status": "active",
+    "links": [
+        {
+            "name": "twitter",
+            "url": "https://twitter.com/moonbeamnetwork"
+        }
+    ]
+}

blockchains/moonriver/info/info.json

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+{
+    "name": "Moonriver",
+    "website": "https://moonbeam.network/networks/moonriver/",
+    "description": "Moonriver is a sister network of Moonbeam, and provides an environment to test new code under real economic conditions.",
+    "explorer": "https://moonriver.moonscan.io/",
+    "research": "",
+    "symbol": "MOVR",
+    "type": "coin",
+    "decimals": 18,
+    "status": "active",
+    "links": [
+        {
+            "name": "twitter",
+            "url": "https://twitter.com/moonrivernw"
+        }
+    ]
+}