[PATCH] Add .gitignore file

[Lassi Kortela]

Here's a patch that adds a .gitignore file at the root of the 
chicken-core repo, so that `git status` doesn't show generated files 
that are not supposed to be committed to the repo.

It doesn't seem possible to ignore *.import.scm wholesale since a few of 
those files are committed:

$ git ls-files | grep -F .import.scm
chicken.base.import.scm
chicken.condition.import.scm
chicken.csi.import.scm
chicken.foreign.import.scm
chicken.syntax.import.scm
chicken.time.import.scm

Likewise, *.c cannot be ignored wholesale since some hand-written C 
source files are present in the same directory as the C files output by csc.

0001-Add-.gitignore-file.patch
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