Added file for supporting linux

The file contains necessary functions.

linux.py

@@ -0,0 +1,71 @@
+''' 
+This file gives the linux support for this repo
+'''
+import sys
+import os
+import subprocess
+import re
+
+
+def get_active_window_raw():
+    '''
+    returns the details about the window not just the title
+    '''
+    root = subprocess.Popen(
+        ['xprop', '-root', '_NET_ACTIVE_WINDOW'], stdout=subprocess.PIPE)
+    stdout, stderr = root.communicate()
+
+    m = re.search(b'^_NET_ACTIVE_WINDOW.* ([\w]+)$', stdout)
+    if m != None:
+        window_id = m.group(1)
+        window = subprocess.Popen(
+            ['xprop', '-id', window_id, 'WM_NAME'], stdout=subprocess.PIPE)
+        stdout, stderr = window.communicate()
+    else:
+        return None
+
+    match = re.match(b"WM_NAME\(\w+\) = (?P<name>.+)$", stdout)
+    if match != None:
+        ret = match.group("name").strip(b'"')
+        #print(type(ret))
+        '''
+        ret is str for python2
+        ret is bytes for python3 (- gives error while calling in other file)
+        be careful
+        '''
+        return ret
+    return None
+
+'''
+this file alone can be run without importing other files
+uncomment the below lines for linux - works - but activities won't be dumped in json file
+(may be it works for other OS also, not sure)
+'''
+# def run():
+#     new_window = None
+#     current_window = get_active_window_title()
+#     while(True):
+#         if new_window != current_window:
+#                 print(current_window)
+#                 print(type(current_window))
+#                 current_window = new_window
+#         new_window = get_active_window_title()
+
+
+# run()
+def get_chrome_url_x():
+        ''' 
+        instead of url the name of the website and the title of the page is returned seperated by '/' 
+        '''
+        detail_full = get_active_window_raw()
+        detail_list = detail_full.split(' - ')
+        detail_list.pop()
+        detail_list = detail_list[::-1]
+        _active_window_name = 'Google Chrome -> ' + " / ".join(detail_list)
+        return _active_window_name
+
+def get_active_window_x():
+    full_detail = get_active_window_raw()
+    detail_list = None if None else full_detail.split(" - ")
+    new_window_name = detail_list[-1]
+    return new_window_name