Defines TypeScript types for rippled account method requests & responses (#1498)

* account_channels

* account_currencies

* account_info

* account_lines

* account_objects

* account_offers

* account_tx

* gateway_balances

* no ripple check

* respond to comments

* export methods

* fix typos

* respond to comments

* edit BaseResponse to be more specific

src/models/methods/accountLines.ts

@@ -0,0 +1,39 @@
+import { BaseRequest, BaseResponse } from './baseMethod'
+import { LedgerIndex } from "../common"
+
+interface Trustline {
+  account: string
+  balance: string
+  currency: string
+  limit: string
+  limit_peer: string
+  quality_in: number
+  quality_out: number
+  no_ripple?: boolean
+  no_ripple_peer?: boolean
+  authorized?: boolean
+  peer_authorized?: boolean
+  freeze?: boolean
+  freeze_peer?: boolean
+}
+
+export interface AccountLinesRequest extends BaseRequest {
+  command: "account_lines"
+  account: string
+  ledger_hash?: string
+  ledger_index?: LedgerIndex
+  peer?: string
+  limit?: number
+  marker?: any
+}
+
+export interface AccountLinesResponse extends BaseResponse {
+  result: {
+    account: string
+    lines: Trustline[]
+    ledger_current_index?: number
+    ledger_index?: number
+    ledger_hash?: string
+    marker?: any
+  }
+}