Build a C# web api.

User Story: As an energy company account manager, I want to able to load a csv file of customer meter readings so that we can monitor their energy consumption and charge them accordingly.

Build a C# web api that connects to an instance of a database and persists the contents of the meter reading csv file. You will be provided with:
• A list of test customers along with their respective Account IDs
• Please seed the Test_Accounts.csv data into your chason data storage technology and validate the meter read data against the accounts

Accepting Criteria:
• Create the following endpoint:
o POST => /meter-reading-uploads
• The end point should be able to process a CSV of meter readings. An example CSV file been provided (Meter_reading.csv)
• Each entry in the csv file should be validated and if valid stored in a DB.
• After processing, the number of successful/failed readings should be returned.

Validation:
• You should not be able to load the same entry twice
• A meter reading must be associated with an account ID to be deemed valid
• Reading values should be in the format NNNNN

FINALLY
• Create a client in the technology of your choosing to consume the API. You can only use angular or JavaScript
• When an account has an existing read, ensure the new read is not older than the existing read
• Added unit testing