Duplicate Avalanche entry into Avalanche C-Chain and Avalanche X-Chain per PR comments (#6134)

* Add logo.png and info.json.

* Obey whitespace convention.

* Update info.json

* Switch logo.png from square avalanche logo to round avalanche mark.

* Duplicate Avalanche entry into 2 chains, avalanchec and avalanchex. Decimals are the same for each chain, and no alternative logo is available.

Co-authored-by: Viktor Radchenko <1641795+vikmeup@users.noreply.github.com>

blockchains/avalanchec/info/info.json

@@ -0,0 +1,16 @@
+{
+    "name": "Avalanche C-Chain",
+    "website": "http://avax.network",
+    "source_code": "https://github.com/ava-labs",
+    "white_paper": "https://www.avalabs.org/whitepapers",
+    "description": "Avalanche is an open-source platform for launching highly decentralized applications, new financial primitives, and new interoperable blockchains. This is the C-Chain, the default smart contract blockchain on Avalanche that enables the creation of any Ethereum-compatible smart contracts.",
+    "explorer": "https://explorer.avax.network",
+    "research": "https://research.binance.com/en/projects/avalanche",
+    "symbol": "AVAX",
+    "type": "coin",
+    "decimals": 9,
+    "status": "active",
+    "tags": [
+        "staking-native"
+    ]
+}

blockchains/avalanchex/info/info.json

@@ -0,0 +1,16 @@
+{
+    "name": "Avalanche X-Chain",
+    "website": "http://avax.network",
+    "source_code": "https://github.com/ava-labs",
+    "white_paper": "https://www.avalabs.org/whitepapers",
+    "description": "Avalanche is an open-source platform for launching highly decentralized applications, new financial primitives, and new interoperable blockchains. This is the X-Chain, the default asset blockchain on Avalanche and enables the creation of new assets, exchanging between assets, and cross-subnet transfers.",
+    "explorer": "https://explorer.avax.network",
+    "research": "https://research.binance.com/en/projects/avalanche",
+    "symbol": "AVAX",
+    "type": "coin",
+    "decimals": 9,
+    "status": "active",
+    "tags": [
+        "staking-native"
+    ]
+}