docs: initial (#3)

README.md

@@ -1,6 +1,64 @@
-# fastify-plugin-example
+# fastify-csv-import
 
-Fastify plugin template.
+A Fastify plugin that enables Fastify applications to parse CSV files and validate their content against a specified schema. It is built using `fast-csv` for parsing, `Ajv` for validation, and `fastify-multipart` for handling file uploads.
+
+## Install
+
+```sh
+npm install @autotelic/fastify-csv-import
+```
+
+## Usage
+
+```js
+import Fastify from 'fastify'
+import fastifyCsvImport from 'fastify-csv-import'
+
+const PORT = 3000
+const fastify = Fastify()
+
+// Define your CSV validation schema
+const validationSchema = {
+  type: 'object',
+  properties: {
+    'Catalog Title': { type: 'string' },
+    SKU: { type: 'string' },
+    'Fixed Price': { type: 'string', format: 'price' }
+  },
+  required: ['Catalog Title', 'SKU', 'Fixed Price']
+}
+
+fastify.register(fastifyCsvImport)
+
+fastify.post('/csv/import', async (req, reply) => {
+  if (!fastify.csvImport) {
+    throw new Error('fastify-csv-import plugin is not available')
+  }
+  const { rows, errors } = await fastify.csvImport({ req, validationSchema })
+  reply.send(rows || errors)
+})
+
+fastify.listen({ port: PORT }, (_, address) => {
+  console.log(`Server listening at ${address}`)
+})
+```
+
+## Example
+
+For a more detailed example, including how to handle various scenarios and errors, please refer to our [usage example](./example/README.md).
+
+## API
+
+### fastify.csvImport({ req, validationSchema })
+
+- `req`: The request object from Fastify.
+- `validationSchema`: A schema object used for validating the CSV data. It must conform to the JSON Schema standard.
+
+`fastify-csv-import` decorates fastify with `csvImport`. The function parses the CSV file from the request, validates each row against the provided schema, and returns an object containing `rows` and `errors`. Rows that pass validation are included in `rows`, while validation errors are recorded in `errors`.
+
+### Configuration Options
+
+- `MAX_CSV_IMPORT`: An optional environment variable to set the maximum CSV file size. If not set, defaults to 50MB.
 
 ## Triggering a Release
 
@@ -12,4 +70,4 @@ Trigger the release workflow via a tag
   git checkout main && git pull
   npm version { minor | major | path }
   git push --follow-tags
-  ```
+  ```