docs: Readme & example

readme.md

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+# Large file reading challenge
+
+Welcome in the recruitment challenge.
+Write an application that, at the endpoint specified by you, returns the yearly average temperatures for a given city in the format array of objects with the following fields: year, averageTemperature.
+
+## Assumptions
+
+- CSV file with data is no less than 3GB in size.
+- The file represents temperature measurements in the format city;yyyy-mm-dd HH:mm:ss.SSS;temp
+- The content of the source file may change during the application's running
+
+## Example source file
+[example_file.csv](example_file.csv)
+
+
+## Example response
+```json
+[
+  {
+	"year": "2021",
+	"averageTemperature": 12.1
+  },
+  {
+	"year": "2022",
+	"averageTemperature": 11.1
+  },
+  {
+	"year": "2023",
+	"averageTemperature": 14.1
+  }
+]
+```