Add demo of CSV enrichment

Signed-off-by: Jesse Szwedko <[email protected]>

csv-enrichment/README.md

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+# CSV enrichment in Vector
+
+**Note:** This feature is unreleased and still under active development. However, if you want to try it out, we would
+love any feedback!
+
+## How to start it
+
+`docker-compose up`
+
+## What it does
+
+This demo shows an example of using CSV enrichment in Vector to enrich events with data from a CSV file.
+
+The CSV file ([`./data/users.csv`](./data/users.csv) contains a list of users with their phone numbers and addresses.
+
+The `vector.toml` configuration contains:
+
+* A `random` source in the `vector.toml` that simply generates some fake events using names that match users in the CSV file
+* A `remap` transform then parses these events and then looks up the corresponding record from the CSV file to enrich the event with more metadata
+* A `console` sink to print out the events