Authentication, Type/Value checks, Use of News API error messages, and addressed a Windows cmd error

.gitignore

@@ -6,3 +6,4 @@ dist/
 *.rst
 venv/
 *log.txt
+*~

README.md

@@ -56,7 +56,25 @@ api.get_everything(q='bitcoin')
 api.get_sources()
 ```
 
+## For Windows users printing to _cmd_ or _powershell_
+
+You will encounter an error if you attempt to print the .json() object to the command line. This is because the '{', '}' curly braces to be printed to the console.
+This becomes especially annoying if developers wish to get 'under the hood'.
+
+Here is the error:
+    UnicodeEncodeError: 'charmap' codec can't encode character '\u2019' in position 1444: character maps to <undefined>
+
+This can be fixed by:
+    - installing 'win-unicode-console'
+        `py -mpip install win-unicode-console`
+    - then running it while calling your python script...
+        `py -mrun myPythonScript.py`
+
+Another option is hardcoding your console to only print in utf-8. This is a bad idea, as it could ruin many other scripts and/or make errors MUCH more difficult to track.
+[More information](https://stackoverflow.com/questions/5419/python-unicode-and-the-windows-console/32176732#32176732
+
+
 ## Support
 
 Feel free to make suggestions or provide feedback regarding the library. Thanks.
-Reach out at [lisivickmatt@gmail.com]('mailto:lisivickmatt@gmail.com')
+Reach out at [lisivickmatt@gmail.com]('mailto:lisivickmatt@gmail.com')

newsapi/const.py

@@ -0,0 +1,13 @@
+TOP_HEADLINES_URL = 'https://newsapi.org/v2/top-headlines'
+EVERYTHING_URL = 'https://newsapi.org/v2/everything'
+SOURCES_URL = 'https://newsapi.org/v2/sources'
+
+countries = {'ae','ar','at','au','be','bg','br','ca','ch','cn','co','cu','cz','de','eg','fr','gb','gr','hk',
+             'hu','id','ie','il','in','it','jp','kr','lt','lv','ma','mx','my','ng','nl','no','nz','ph','pl',
+             'pt','ro','rs','ru','sa','se','sg','si','sk','th','tr','tw','ua','us','ve','za'}
+
+languages = {'ar','en','cn','de','es','fr','he','it','nl','no','pt','ru','sv','ud'}
+
+categories = {'business', 'entertainment', 'general', 'health', 'science', 'sports', 'technology'}
+
+sort_method = {'relevancy','popularity','publishedAt'}