ADT #1810565: Fix symlinks for ADT/DDMS show up in git

Use a .gitignore to prevent files created by
./development/tools/eclipse/scripts/create_all_symlinks.sh
from appearing in git.

This is for Linux. Not sure if we need to amend that for Mac/Windows.
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7d49c4a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,48 @@
+*~
+tools/eclipse/plugins/com.android.ide.eclipse.adt/androidprefs.jar
+tools/eclipse/plugins/com.android.ide.eclipse.adt/jarutils.jar
+tools/eclipse/plugins/com.android.ide.eclipse.adt/kxml2-2.3.0.jar
+tools/eclipse/plugins/com.android.ide.eclipse.adt/layoutlib_api.jar
+tools/eclipse/plugins/com.android.ide.eclipse.adt/layoutlib_utils.jar
+tools/eclipse/plugins/com.android.ide.eclipse.adt/ninepatch.jar
+tools/eclipse/plugins/com.android.ide.eclipse.adt/sdklib.jar
+tools/eclipse/plugins/com.android.ide.eclipse.adt/sdkstats.jar
+tools/eclipse/plugins/com.android.ide.eclipse.adt/sdkuilib.jar
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/add.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/backward.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/clear.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/d.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/debug-attach.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/debug-error.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/debug-wait.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/delete.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/device.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/down.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/e.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/edit.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/empty.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/emulator.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/forward.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/gc.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/halt.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/heap.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/i.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/importBug.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/load.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/pause.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/play.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/pull.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/push.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/save.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/thread.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/up.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/v.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/w.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/icons/warning.png
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/libs/jcommon-1.0.12.jar
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/libs/jfreechart-1.0.9-swt.jar
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/libs/jfreechart-1.0.9.jar
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/src/com/android/ddmlib
+tools/eclipse/plugins/com.android.ide.eclipse.ddms/src/com/android/ddmuilib
+tools/eclipse/plugins/com.android.ide.eclipse.tests/kxml2-2.3.0.jar
+tools/eclipse/plugins/com.android.ide.eclipse.tests/unittests/com/android/ddmlib