Add PrefManager code

app/src/main/java/net/foucry/pilldroid/PrefManager.java

@@ -0,0 +1,38 @@
+package net.foucry.pilldroid;
+
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+    /**
+     * Created by Lincoln on 05/05/16.
+     */
+    public class PrefManager {
+        SharedPreferences pref;
+        SharedPreferences.Editor editor;
+        Context _context;
+
+        // shared pref mode
+        int PRIVATE_MODE = 0;
+
+        // Shared preferences file name
+        private static final String PREF_NAME = "androidhive-welcome";
+
+        private static final String IS_FIRST_TIME_LAUNCH = "IsFirstTimeLaunch";
+
+        public PrefManager(Context context) {
+            this._context = context;
+            pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
+            editor = pref.edit();
+        }
+
+        public void setFirstTimeLaunch(boolean isFirstTime) {
+            editor.putBoolean(IS_FIRST_TIME_LAUNCH, isFirstTime);
+            editor.commit();
+        }
+
+        public boolean isFirstTimeLaunch() {
+            return pref.getBoolean(IS_FIRST_TIME_LAUNCH, true);
+        }
+
+    }