Add Linear Client- Test endpoints added.

src/linear-client.ts

@@ -0,0 +1,47 @@
+import { AxiosRequestConfig } from 'axios';
+import { GenericAPIResponse, getBaseRESTInverseUrl, RestClientInverseOptions } from './util/requestUtils';
+import RequestWrapper from './util/requestWrapper';
+import { SharedEndpoints } from './shared-endpoints';
+
+export class LinearClient extends SharedEndpoints {
+    protected requestWrapper: RequestWrapper;
+
+    /**
+   * @public Creates an instance of the inverse REST API client.
+   *
+   * @param {string} key - your API key
+   * @param {string} secret - your API secret
+   * @param {boolean} [livenet=false]
+   * @param {RestClientInverseOptions} [restInverseOptions={}] options to configure REST API connectivity
+   * @param {AxiosRequestConfig} [requestOptions={}] HTTP networking options for axios
+   */
+
+    constructor(
+        key?: string | undefined,
+        secret?: string | undefined,
+        livenet?: boolean,
+        restInverseOptions:RestClientInverseOptions = {}, // TODO: Rename this type to be more general.
+        requestOptions: AxiosRequestConfig = {}
+      ) {
+        super()
+        this.requestWrapper = new RequestWrapper(
+            key, 
+            secret, 
+            getBaseRESTInverseUrl(livenet), 
+            restInverseOptions, 
+            requestOptions
+        );
+        return this;
+      }
+
+    /**
+   * @public Get the last funding rate.
+   */
+
+    getLastFundingRate(params: {
+      symbol: string;
+    }): GenericAPIResponse {
+      return this.requestWrapper.get('public/linear/funding/prev-funding-rate', params);
+    }
+
+}