7/cs-pointers: Add cellophane-sheet-pointers

This is a cellophane-sheet-pointers I wrote in high school.  Make the
initial import.
.gitignore: move to {9,10}/foss.in/

The toplevel .gitignore ignores *.tex files, which is only valid for
projects that have been compiled using org-mode (ie. the foss.in
presentations).  Since we're adding more projects to this repository,
move it to its rightful place.
9/curve-fitting: initial import of curve-fitting

This is a presentation I made in college about curve-fitting.