Updated lexer readme

Author: tyagio

Lexer/Readme.md

@@ -6,9 +6,6 @@
 
 Lexical analysis is the process of converting a string of characters into a sequence of tokens. A token is a string with an assigned and thus identified meaning. The sequence of tokens is called a token stream. The token stream is used as input for the parser.
 
-## PPT and video links
-
-## Language Specification
 
 ## Lexical Analysis
 
@@ -17,9 +14,17 @@ Lexical analysis is the process of converting a string of characters into a sequ
 <!-- ### Finite Automata -->
 
 ### Lexical Analyzer
+Recognizes all basic keywords such as cns,var,Tensor etc and operators used by our language 
 
 ### Error Handling
-
+Our lexer can recognize unclosed comments ,strings and overflows in constant values
 ### Testing
+go inside the Lexer folder and then run
+```console
+make 
+make test 
+```
 
+This should run the test cases and report their results
 ## References
+ C Lexer