Add series of tutorials : Android for beginners and Object oriented programming for PHP (#2988)

* Add series of tutorials : Android for beginners and Object oriented programming for PHP

* Add new line at the end of the file , prevent warning  Missing newline character at end of file.

free-courses-bg.md

+### Index
+
+* [Android](#android)
+* [PHP](#php)
+
+
+### Android
+
+* [Въведение в Андроид](https://www.youtube.com/playlist?list=PLjsqymUqgpSTXtlngZCXRHEp8-FmDHHfL) - Иван Ванков
+
+
+### PHP
+
+* [Обектно ориентирано програмиране с PHP](https://www.youtube.com/playlist?list=PL1zMmEDXa_Z8uHtKAl-zSrBFDRNq8JDFG) - Иван Ванков