Add models for mapping transaction data.

src/app/_models/index.ts

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+export * from './transaction';

src/app/_models/transaction.ts

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+export class BlocksBloom {
+  low: number;
+  blockFilter: string;
+  blocktxFilter: string;
+  alg: string;
+  filterRounds: number;
+}
+
+export class Token {
+  address: string;
+  name: string;
+  symbol: string;
+}
+
+export class Tx {
+  block: number;
+  success: boolean;
+  timestamp: number;
+  txHash: string;
+  txIndex: number;
+}
+
+export class Transaction {
+  from: string;
+  to: string;
+  token: Token;
+  tx: Tx;
+  value: number;
+}
+
+export class Conversion {
+  destinationToken: Token;
+  fromValue: number;
+  sourceToken: Token;
+  toValue: number;
+  trader: string;
+  tx: Tx;
+}