Add in templates for ccpo user form and sketch out route functions

atst/forms/ccpo_user.py

@@ -0,0 +1,13 @@
+from flask_wtf import FlaskForm
+from wtforms.validators import Required, Length
+from wtforms.fields import StringField
+
+from atst.forms.validators import IsNumber
+from atst.utils.localization import translate
+
+
+class CCPOUserForm(FlaskForm):
+    dod_id = StringField(
+        translate("forms.new_member.dod_id_label"),
+        validators=[Required(), Length(min=10), IsNumber()],
+    )