gitignore updated

Author: prathameshnium

.gitignore

@@ -115,3 +115,9 @@ capture_screenshots.py
 pica/lockin
 paper/JOSS_submition_supplimentory.md
 print_tree.py
+pica/CHANGELOG.md
+pica/docs/User_Manual.md
+pica/docs/Instruments_Manuals_Lists.md
+pica/README.md
+pica/LICENSE
+pica/CONTRIBUTING.md