Added Makefile and README

Author: megastep

Makefile

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+MYSQL_VERSION = 8.0.18
+
+all: mysql-$(MYSQL_VERSION)-layer.zip mariadb-layer.zip
+
+mysql: mysql-$(MYSQL_VERSION)-layer.zip
+mariadb: mariadb-layer.zip
+
+mysql-$(MYSQL_VERSION)-layer.zip:
+	docker build -f Dockerfile.mysql . -t mysql-layer --build-arg VERSION=$(MYSQL_VERSION)
+	docker container cp $(shell docker container create mysql-layer):/root/mysql-$(MYSQL_VERSION)-layer.zip .
+
+mariadb-layer.zip:
+	docker build -f Dockerfile.mariadb . -t mariadb-layer
+	docker container cp $(shell docker container create mariadb-layer):/root/mariadb-layer.zip .
+
+clean:
+	rm -f *.zip
+

README.md

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+# AWS Lambda Layers for MySQL and MariaDB commands
+
+These layers add the `mysql` client commands in the form of a layer to be used with [AWS Lambda](https://aws.amazon.com/lambda/).
+
+This is useful for Lambda functions that need to run MySQL commands to quickly import data to a RDS server, for example. It can be easier than using the MySQL API in the language of your choice. Particularly useful in coordination with a [Bash lambda](https://github.com/gkrizek/bash-lambda-layer) layer.
+
+The layers (in the form of zip files) are built in Docker using the official AmazonLinux image, to match the typicial Lambda runtime environment.
+
+- The MySQL layer is built from the official source (v8.0.18)
+- THe MariaDB layer is built from files in the official `mariadb` AmazonLinux package.
+
+## Download
+
+Pre-built zip archives that can be uploaded to your AWS account are available on the [releases](https://github.com/megastep/mysql-lambda/releases) page.
+
+## Building the layers
+
+If you have a working Docker setup, you just need to enter `make` to build both the MySQL and MariaDB layers. Alternatively:
+
+- `make mysql` builds the MySQL variant from source.
+- `make mariadb` builds the MariaDB variant from the pre-built packages.
+
+Note that the MySQL 8.0 variant takes considerably longer to build from source.
+
+
+### Author
+
+[Stephane Peter](https://stephanepeter.com/) (@megastep) - [Sponsor me!](https://github.com/sponsors/megastep)