Implement add bookmark route

bookmarks/forms/__init__.py

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+from .bookmark_form import *

bookmarks/forms/bookmark_form.py

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+from django import forms
+
+from ..models import Bookmark
+
+auto_fill_placeholder = 'Leave empty to fill from website metadata'
+
+
+class BookmarkForm(forms.ModelForm):
+    # Use URLField for URL
+    url = forms.URLField()
+    # Do not require title and description in form as we fill these automatically if they are empty
+    title = forms.CharField(max_length=512,
+                            required=False,
+                            widget=forms.TextInput(attrs={'placeholder': auto_fill_placeholder}))
+    description = forms.CharField(required=False,
+                                  widget=forms.Textarea(attrs={'placeholder': auto_fill_placeholder}))
+
+    class Meta:
+        model = Bookmark
+        fields = ['url', 'title', 'description']