Added ABAP as language as well as a first resource (#4221)
* Update free-programming-books-de.md * Update free-programming-books-de.md Removed the 0 * Update free-programming-books-de.md * 20201018 * 20201018b
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* Update free-programming-books-de.md * Update free-programming-books-de.md Removed the 0 * Update free-programming-books-de.md * 20201018 * 20201018b