Add books in Latvian (#6979)

* Create free-programming-books-lv.md

* Added Latvian

README.md

@@ -101,6 +101,7 @@ This project lists books and other resources grouped by genres:
 + [Italian / italiano](books/free-programming-books-it.md)
 + [Japanese / 日本語](books/free-programming-books-ja.md)
 + [Korean / 한국어 [韓國語]](books/free-programming-books-ko.md)
++ [Latvian / Latviešu](books/free-programming-books-lv.md)
 + [Norwegian / Norsk](books/free-programming-books-no.md)
 + [Persian / Farsi (Iran) / فارسى](books/free-programming-books-fa_IR.md)
 + [Polish / polski / język polski / polszczyzna](books/free-programming-books-pl.md)

books/free-programming-books-lv.md

+### Index
+
+* [C++](#cpp)
+* [Python](#python)
+
+
+### <a id="cpp"></a>C++
+
+* [Programmēšana un C++](http://home.lu.lv/~janiszu/courses/eprg/eprg.all.pdf) - Jānis Zuters (PDF)
+
+
+### Python
+
+* [Programmēšanas pamati ar valodu Python](http://home.lu.lv/~janiszu/courses/python/python3.pdf) - Jānis Zuters (PDF)