Add proguard-project.txt to the .gitignore file
Add proguard-project.txt to the .gitignore file

The generated file proguard-project.txt was previously checked
in accidentally.  This patch adds it to the .gitignore so that
errors like this won't happen in the future.

Change-Id: Ic26b0d48bbb4bf50445e7314ecac6d9979b51e9d
Signed-off-by: hyuna0213.jo <a3aecee2eabd6f87461b5d05d6fd0eaf35e269ed@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1196
Reviewed-by: Erich Keane <ec9f61fe526c14bb62c55d7c978f025ee6b3583d@intel.com>
Tested-by: Erich Keane <ec9f61fe526c14bb62c55d7c978f025ee6b3583d@intel.com>

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