[gnome-software/wip/mcrha/add-gitignore] misc: Add .gitignore file

[Milan Crha <mcrha src gnome org>]

commit c2e4e1abd568043ce6f382408b372c1fabccbceb
Author: Milan Crha <mcrha redhat com>
Date:   Fri Sep 18 11:01:56 2020 +0200

    misc: Add .gitignore file
    
    The `git status -u` shows the whole content of the 'build' directory
    and the the top directories of the `subprojects` directory, making
    it too easy to overlook some files not being part of the git checkout,
    when they are supposed to be there.

 .gitignore | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..7695b0a5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+build
+_build
+.build
+*.orig
+*.rej
+subprojects/libglib-testing/
+subprojects/libxmlb/
+subprojects/malcontent/
+subprojects/sysprof/