added thumbnail line to db class for photos, and also updated readme

README

@@ -3,4 +3,4 @@ In here we can put instructions on how to run this / any general info
 pip packages:
     * pymediainfo
     * PIL (should be there by default)
-    *
+    * ExifRead

photos.py

@@ -40,6 +40,7 @@ class Photos(db.Model):
     size_MB = db.Column(db.Integer, unique=False, nullable=False)
     # hash might not be unique, this could be the source of dupe problems
     hash = db.Column(db.Integer, unique=True, nullable=True)
+    thumnbnail = db.Column(db.BYTE, unique=False, nullable=False)
 
     def __repr__(self):
         return "<id: {}, name: {}>".format(self.id, self.name )