Add 'About' section

artemis.py

@@ -67,6 +67,15 @@ class Artemis(QMainWindow, Ui_MainWindow):
         self.action_add_a_signal.triggered.connect(
             lambda: webbrowser.open(Constants.ADD_SIGNAL_LINK)
         )
+        self.action_aresvalley_com.triggered.connect(
+            lambda: webbrowser.open(Constants.ARESVALLEY_LINK)
+        )
+        self.action_forum.triggered.connect(
+            lambda: webbrowser.open(Constants.FORUM_LINK)
+        )
+        self.action_rtl_sdr_com.triggered.connect(
+            lambda: webbrowser.open(Constants.RTL_SDL_LINK)
+        )
         self.db = None
         self.current_signal_name = ''
         self.signal_names = []

artemis.ui

@@ -7143,10 +7143,19 @@ QSlider::handle:horizontal {
     <addaction name="action_sigidwiki_com"/>
     <addaction name="action_add_a_signal"/>
    </widget>
+   <widget class="QMenu" name="menuAbout">
+    <property name="title">
+     <string>About</string>
+    </property>
+    <addaction name="action_aresvalley_com"/>
+    <addaction name="action_forum"/>
+    <addaction name="action_rtl_sdr_com"/>
+   </widget>
    <addaction name="menuFile"/>
    <addaction name="menuUpdates"/>
    <addaction name="menu_themes"/>
    <addaction name="menuSigidwiki"/>
+   <addaction name="menuAbout"/>
   </widget>
   <widget class="QStatusBar" name="statusbar">
    <property name="styleSheet">
@@ -7178,6 +7187,21 @@ QSlider::handle:horizontal {
     <string>Add a signal</string>
    </property>
   </action>
+  <action name="action_forum">
+   <property name="text">
+    <string>Forum</string>
+   </property>
+  </action>
+  <action name="action_aresvalley_com">
+   <property name="text">
+    <string>aresvalley.com</string>
+   </property>
+  </action>
+  <action name="action_rtl_sdr_com">
+   <property name="text">
+    <string>RTL-SDR.com</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>

constants.py

@@ -77,6 +77,9 @@ class Constants(object):
     CLICK_TO_UPDATE_STR = "Click to update"
     SIGIDWIKI           = "https://www.sigidwiki.com/wiki/Signal_Identification_Guide"
     ADD_SIGNAL_LINK     = "https://www.sigidwiki.com/index.php/Special:FormEdit/Signal/?preload=Signal_Identification_Wiki:Signal_form_preload_text"
+    FORUM_LINK          = "https://aresvalley.com/community/"
+    ARESVALLEY_LINK     = "https://aresvalley.com/"
+    RTL_SDL_LINK        = "https://www.rtl-sdr.com/"
     UPDATING_STR        = "Updating..."
     ACF_DOCS            = "https://aresvalley.com/documentation/"
     FORECAST_XRAY       = "https://services.swpc.noaa.gov/text/goes-xray-flux-primary.txt"