Adding readme file

Author: dancita

README.md

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+# string-processor
+
+Tech Test
+=========
+
+# Overview 
+
+The test consists of two projects:
+
+- StringProcessor - the main project.
+- StringProcessor.Tests - the unit test project (using xUnit).
+
+# Tasks
+
+1. Write code in the main project to ensure that the four unit tests pass.  
+   **Note: for the purposes of this test, a word includes punctuation. "I'm" is a single word and "that." is five characters long (including the full-stop).**
+  
+
+2. Add a project and code to the solution to fulfil the following requirement:
+   > GIVEN a text string  
+   > WHEN it is sent to a HTTP API endpoint  
+   > THEN JSON representing the populated StringStatsModel is returned  
+   
+   Ensure that you can test this via your preferred method (Postman, integration test or webpage, etc)  
+  
+
+3. (Optional / for bonus points) Write a fifth unit test which tests very large input to the StringStatsProcessor.Run(string) method.