move blueprints in dedicated folder

app/blueprints/contributions/forms.py

@@ -0,0 +1,47 @@
+from flask_wtf import FlaskForm
+from wtforms import (
+    StringField,
+    SubmitField,
+    SelectMultipleField,
+    IntegerField
+)
+from wtforms.validators import InputRequired, Length
+
+
+class ContributionBaseForm(FlaskForm):
+    title = StringField(
+        'Title',
+        validators=[InputRequired(), Length(max=64)]
+    )
+    description = StringField(
+        'Description',
+        validators=[InputRequired(), Length(max=255)]
+    )
+    version = StringField(
+        'Version',
+        validators=[InputRequired(), Length(max=16)]
+    )
+    publisher = StringField(
+        'Publisher',
+        validators=[InputRequired(), Length(max=128)]
+    )
+    publisher_url = StringField(
+        'Publisher URL',
+        validators=[InputRequired(), Length(max=512)]
+    )
+    publishing_url = StringField(
+        'Publishing URL',
+        validators=[InputRequired(), Length(max=512)]
+    )
+    publishing_year = IntegerField(
+        'Publishing year',
+        validators=[InputRequired()]
+    )
+    compatible_service_versions = SelectMultipleField(
+        'Compatible service versions'
+    )
+    submit = SubmitField()
+
+
+class UpdateContributionBaseForm(ContributionBaseForm):
+    pass