[documentation] Update README with usage examples for crypto endpoint

[hydrosquall]

Motivation

• We document all the main ticker price endpoints in the README, but we don't have example for crypto functions. Thanks @sher85 for noticing this in Add support for tiingo crypto endpoints to TiingoClient #340 (comment) .

Subtasks

• Update README https://github.com/hydrosquall/tiingo-python/blob/master/README.rst
• Update USAGE.rst
• REACH - Add a sample jupyter notebook that interacts with the crypto endpoints to show a practical usecase, in the /examples folder. Visitors will be able to visit example using a binder link like this: https://mybinder.org/v2/gh/hydrosquall/tiingo-python/master?filepath=examples

Resources

• The official API documentation https://api.tiingo.com/documentation/crypto
• The PR which added the crypto endpoint functions: Add support for tiingo crypto endpoints to TiingoClient #340, which contains test code showing how each function can be called (https://github.com/n1rna/tiingo-python/blob/fb1295376a1049b8d2d8819a648b82c9f7c0087b/tests/test_crypto.py#L19-L37 )

[GenusGeoff]

I added two short examples for the usage of the endpoint in the README.rst file

[hydrosquall]

@GenusGeoff thanks for taking a look at this! I'm not sure I can see the examples you're referring to, but if you open a PR in this repository, I'd be glad to add it to the project.

[GenusGeoff]

Okay, well I suppose my newness to GitHub provoked this. You can find my basic examples at the following link. It probably requires some cleanup to be more in-line with your use of language and formatting, but this might be a decent start.

README.rst

[datatalking]

Ok I added the ipynb file for the crypto, most of it works fine there is some help I need on cell 14.

I tried working on the documentation for USAGE.rst but while I can adjust the code, documenting it is probably left for one who knows that area.

I put the notebook here ==> tingo/examples/crypto-usage-tiingo-pandas.ipynb

Once it looks good or we can adjust it to fit I'll create a PR.

Does this mean I get to be listed as a contributor for tiingo-python?