Merge pull request #3851 from shaedrich/ll-parser

Add topic "LL parser"

Author: kenyonj

topics/ll-parser/index.md

@@ -0,0 +1,8 @@
+---
+display_name: LL parser
+short_description: An LL parser is a top-down parser for a restricted context-free language.
+topic: ll-parser
+related: lr-parser
+wikipedia_url: https://en.wikipedia.org/wiki/LL_parser
+---
+In computer science, an LL parser (Left-to-right, leftmost derivation) is a top-down parser for a restricted context-free language. It parses the input from Left to right, performing Leftmost derivation of the sentence.