created base gallery app, made start on documentation.

src/gallery/admin.py

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+from django.contrib import admin
+
+# Register your models here.

src/gallery/apps.py

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+from django.apps import AppConfig
+
+
+class GalleryConfig(AppConfig):
+    name = 'gallery'

src/gallery/models.py

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+from django.db import models
+
+# Create your models here.

src/gallery/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

src/gallery/views.py

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+from django.shortcuts import render
+
+# Create your views here.