update README.md

Author: prajwalsuvarna

README.md

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+# CD
+CD mini project
+
+1.
+```
+yacc -t -g --report=all -d main.y
+```
+
+2.
+```
+lex main.l
+```
+
+3.
+```
+gcc *.c -ll
+```
+
+# Canonical Itemsets
+![output](https://github.com/prajwalsuvarna/CD/assets/97435165/f51eb204-0496-4e35-9349-2cdfa9077513)
+