Added a constructor with custom http client (#86)

Author: Younes-Charfaoui

src/main/java/org/typesense/api/Client.java

@@ -1,6 +1,8 @@
 package org.typesense.api;
 
 
+import okhttp3.OkHttpClient;
+
 import java.util.HashMap;
 import java.util.Map;
 
@@ -32,6 +34,26 @@ public class Client {
     public Debug debug;
     public MultiSearch multiSearch;
 
+    public Client(Configuration configuration, OkHttpClient okHttpClient){
+        this.configuration = configuration;
+        this.apiCall = new ApiCall(configuration, okHttpClient);
+        collections = new Collections(apiCall);
+        this.individualCollections = new HashMap<>();
+        this.aliases = new Aliases(this.apiCall);
+        this.individualAliases = new HashMap<>();
+        this.keys = new Keys(this.apiCall);
+        this.individualKeys = new HashMap<>();
+        this.health = new Health(this.apiCall);
+        this.operations = new Operations(this.apiCall);
+        this.metrics = new Metrics(this.apiCall);
+        this.debug = new Debug(this.apiCall);
+        this.multiSearch = new MultiSearch(this.apiCall);
+        this.analytics = new Analytics(this.apiCall);
+        this.stemming = new Stemming(this.apiCall);
+        this.stopwords = new Stopwords(this.apiCall);
+        this.individualStopwordsSets = new HashMap<>();
+    }
+
     public Client(Configuration configuration){
         this.configuration = configuration;
         this.apiCall = new ApiCall(configuration);