Update README.md

Author: AndroidDeveloperLB

README.md

@@ -2,3 +2,13 @@ AutoFitTextView
 ===============
 
 A TextView that automatically fit its font and line count based on its available size and content
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+This code is heavily based on the next StackOverflow post:
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+http://stackoverflow.com/questions/16017165/auto-fit-textview-for-android/21851239
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+Note that even though the sample is of API 16, it should work fine on most cases for much older versions.
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+This is not a requirement. It's more of a suggestion, because older versions might have issues as a cause of this bug:
+https://code.google.com/p/android/issues/detail?id=22493 , which affects API 12-15 (including).
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