feat: add lang support

Author: Coutable Bastien

README.md

@@ -49,6 +49,11 @@ helper.setUnits(Units.IMPERIAL);
 
 2. ```Units.METRIC (Celsius)```
 
+#### Set language (default : en)
+
+``` java
+helper.setLang(Lang.ENGLISH);
+```
 
 ## Features
 

app/src/main/java/com/kwabenaberko/openweathermap/MainActivity.java

@@ -4,6 +4,7 @@
 import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
 
+import com.kwabenaberko.openweathermaplib.Lang;
 import com.kwabenaberko.openweathermaplib.Units;
 import com.kwabenaberko.openweathermaplib.implementation.OpenWeatherMapHelper;
 import com.kwabenaberko.openweathermaplib.models.currentweather.CurrentWeather;
@@ -24,6 +25,8 @@ protected void onCreate(Bundle savedInstanceState) {
         helper.setApiKey(getString(R.string.OPEN_WEATHER_MAP_API_KEY));
         //Set Units
         helper.setUnits(Units.METRIC);
+        //Set lang
+        helper.setLang(Lang.ENGLISH);
 
         /*
         This Example Only Shows how to get current weather by city name

openweathermaphelper/src/main/java/com/kwabenaberko/openweathermaplib/Lang.java

@@ -0,0 +1,38 @@
+package com.kwabenaberko.openweathermaplib;
+
+public class Lang {
+
+    public static final String ARABIC = "ar";
+    public static final String BULGARIAN = "bg";
+    public static final String CATALAN = "ca";
+    public static final String CZECH = "cz";
+    public static final String GERMAN = "de";
+    public static final String GREEK = "el";
+    public static final String ENGLISH = "en";
+    public static final String PERSIAN = "fa";
+    public static final String FINNISH = "fi";
+    public static final String FRENCH = "fr";
+    public static final String GALICIAN = "gl";
+    public static final String CROATIAN = "hr";
+    public static final String HUNGARIAN = "hu";
+    public static final String ITALIAN = "it";
+    public static final String JAPANESE = "ja";
+    public static final String KOREAN = "kr";
+    public static final String LATVIAN = "la";
+    public static final String LITHUANIAN = "lt";
+    public static final String MACEDONIAN = "mk";
+    public static final String DUTCH = "nl";
+    public static final String POLISH = "pl";
+    public static final String PORTUGUESE = "pt";
+    public static final String ROMANIAN = "ro";
+    public static final String RUSSIAN = "ru";
+    public static final String SWEDISH = "se";
+    public static final String SLOVAK = "sk";
+    public static final String SLOVENIAN = "sl";
+    public static final String SPANISH = "es";
+    public static final String TURKISH = "tr";
+    public static final String UKRAINIAN = "ua";
+    public static final String VIETNAMESE = "vi";
+    public static final String CHINESE_SIMPLIFIED = "zh_cn";
+    public static final String CHINESE_TRADITIONAL = "zh_tw";
+}

openweathermaphelper/src/main/java/com/kwabenaberko/openweathermaplib/implementation/OpenWeatherMapHelper.java

@@ -52,6 +52,10 @@ public void setUnits(String units){
         options.put("units", units);
     }
 
+    public void setLang(String lang) {
+        options.put("lang", lang);
+    }
+
 
     private Throwable NoAppIdErrMessage() {
         return new Throwable("UnAuthorized. Please set a valid OpenWeatherMap API KEY by using the setApiKey method.");