refactored classes in own modules files, added proto content module

classes/content.py

@@ -0,0 +1,35 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+from PyQt5 import QtCore
+from PyQt5.QtGui import QFont, QSyntaxHighlighter
+from PyQt5.QtWidgets import QWidget, QLabel, QTabWidget, QHBoxLayout, QSplitter, QPlainTextEdit
+
+
+class Summary(QLabel):
+   def __init__(self):
+      super(Summary, self).__init__()
+
+
+
+class ContentTab(QWidget):
+   def __init__(self, core):
+      super(ContentTab, self).__init__()
+
+      # self.grid = QGridLayout()
+      hbox = QHBoxLayout()
+      hbox.setContentsMargins(0,0,0,0)
+      self.setLayout(hbox)
+
+      hsplitter = QSplitter(QtCore.Qt.Horizontal)
+
+      self.summary = QLabel("Summary (markdown files list).")
+      hsplitter.addWidget(self.summary)
+
+      self.mdsource = QLabel("Content (markdown src).")
+      hsplitter.addWidget(self.mdsource)
+
+      self.mdpreview = QLabel("Content (markdown preview).")
+      hsplitter.addWidget(self.mdpreview)
+
+      hbox.addWidget(hsplitter)