token: Move JSON files into contrib directory.

contrib/token/Makefile

@@ -0,0 +1,23 @@
+.POSIX:
+
+DLTOOL = wget -nv --show-progress -O-
+
+LISTS = \
+	erc20_token_list.json \
+	solana_token_list.json
+
+ERC20 = https://tokens.coingecko.com/uniswap/all.json
+SOL = https://github.com/solana-labs/token-list/raw/main/src/tokens/solana.tokenlist.json
+
+all: $(LISTS)
+
+erc20_token_list.json:
+	$(DLTOOL) $(ERC20) > $@
+
+solana_token_list.json:
+	$(DLTOOL) $(SOL) | sed \
+		-e 's@"symbol": "BTC"@"symbol": "SBTC"@' \
+		-e 's@"symbol": "ETH"@"symbol": "SETH"@' \
+		> $@
+
+.PHONY: all $(LISTS)

contrib/token/bitcoin_token_list.json

@@ -0,0 +1,12 @@
+{
+  "name": "Bitcoin Token List",
+  "tokens": [
+    {
+      "chainId": 1,
+      "address": "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa",
+      "symbol": "BTC",
+      "name": "Bitcoin",
+      "decimals": 8
+    }
+  ]
+}