add .gitattributes and normalise line endings for .sh files

fixes #6136

.gitattributes

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+*.sh   text eol=lf

app/dashboard/migrations/0086_merge_20200306_1954.py

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+# Generated by Django 2.2.4 on 2020-03-06 19:54
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dashboard', '0085_activity_hackathonevent'),
+        ('dashboard', '0085_merge_20200303_2256'),
+    ]
+
+    operations = [
+    ]

app/dashboard/migrations/0089_merge_20200307_2024.py

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+# Generated by Django 2.2.4 on 2020-03-07 20:24
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dashboard', '0086_merge_20200306_1954'),
+        ('dashboard', '0088_auto_20200309_2046'),
+    ]
+
+    operations = [
+    ]

app/dashboard/migrations/0090_merge_20200309_0426.py

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+# Generated by Django 2.2.4 on 2020-03-09 04:26
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dashboard', '0089_merge_20200310_1649'),
+        ('dashboard', '0089_merge_20200307_2024'),
+    ]
+
+    operations = [
+    ]

app/dashboard/migrations/0091_merge_20200310_1136.py

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+# Generated by Django 2.2.4 on 2020-03-10 11:36
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dashboard', '0090_merge_20200309_0426'),
+        ('dashboard', '0090_auto_20200313_1425'),
+    ]
+
+    operations = [
+    ]

app/dashboard/migrations/0092_merge_20200317_1849.py

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+# Generated by Django 2.2.4 on 2020-03-17 18:49
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dashboard', '0091_merge_20200316_1102'),
+        ('dashboard', '0091_merge_20200310_1136'),
+    ]
+
+    operations = [
+    ]