add constants for token decimals

ts/client/src/constants/tokens.ts

@@ -0,0 +1,15 @@
+export const getTokenDecimals = (symbol: string) => {
+  const tokenMeta = tokens.find((t) => t.symbol === symbol);
+
+  if (!tokenMeta) throw new Error('TokenDecimalError: Token not found');
+
+  return tokenMeta.decimals;
+};
+
+const tokens = [
+  { symbol: 'USDC', decimals: 6 },
+  { symbol: 'SOL', decimals: 9 },
+  { symbol: 'BTC', decimals: 6 },
+];
+
+export default tokens;