Allow adding a file to the .git/info/exclude file

test/integration/excludeMenu/expected/repo/.git_keep/HEAD

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+ref: refs/heads/master

test/integration/excludeMenu/expected/repo/.git_keep/config

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+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = false
+	logallrefupdates = true
+	ignorecase = true
+	precomposeunicode = true

test/integration/excludeMenu/expected/repo/.git_keep/description

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+Unnamed repository; edit this file 'description' to name the repository.

test/integration/excludeMenu/expected/repo/.git_keep/info/exclude

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+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~
+
+myfile1

test/integration/excludeMenu/expected/repo/myfile1

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+test1

test/integration/excludeMenu/recording.json

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+{"KeyEvents":[{"Timestamp":1418,"Mod":0,"Key":256,"Ch":105},{"Timestamp":1725,"Mod":0,"Key":256,"Ch":101},{"Timestamp":3207,"Mod":0,"Key":256,"Ch":113}],"ResizeEvents":[{"Timestamp":0,"Width":170,"Height":55}]}

test/integration/excludeMenu/setup.sh

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+#!/bin/sh
+
+set -e
+
+cd $1
+git config user.email "CI@example.com"
+git config user.name "CI"
+
+git init
+
+
+echo test1 > myfile1
+

test/integration/excludeMenu/test.json

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+{
+    "description": "In this test a file is added to .git/info/exclude using the ignore or exclude menu",
+    "speed": 5
+}