chore(doc): add adopters.md file (#345)

Signed-off-by: w3aman <[email protected]>

Adopters.md

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+# OpenEBS ZFS-LocalPV Adopters
+
+This is the list of organizations and users that publicly shared details of how they are using OpenEBS ZFS-LocalPV CSI driver for running their Stateful workloads. Please send PRs to add or remove organizations/users.
+
+The list of organizations that have publicly shared the usage of ZFS-LocalPV.
+
+
+| Organization | Stateful Workloads | Success Story |
+| :--- | :--- | :--- |
+| [IDNT](https://idnt.net/) | Elasticsearch, RabbitMQ, KubeVirt, Prometheus, YugabyteDB, Couchbase, MySQL | [English](https://github.com/openebs/openebs/blob/master/adopters/idnt/README.md) |
+| [Optoro](https://www.optoro.com/) | PostgreSQL, MySQL, Apache Kafka, Redis, ElasticSearch, Prometheus, Thanos | [English](https://github.com/openebs/openebs/blob/master/adopters/optoro/README.md) |
+| [Zeta Associates](https://www.zai.com/) | Elasticsearch, MariaDB, MinIO, PostgreSQL, Prometheus, Kafka, Cassandra | [English](https://github.com/openebs/openebs/blob/master/adopters/zetaassociates/README.md) |
+
+
+
+The list of users that have publicly shared the usage of ZFS-LocalPV.
+
+
+| User | Stateful Workloads | Success Story |
+| :--- | :--- | :--- |
+| [Art Win](https://github.com/artw) | Graylog, Zabbix, Authelia, Guacamole (Elastic, MySQL, MongoDB, Redis) | [English](https://github.com/openebs/openebs/blob/master/adopters/users/artw/README.md)  |
+| [Mark V.](https://github.com/mikroskeem) | Concourse CI, Mattermost, Minio, Few game servers, Bunch of micro services | [English](https://github.com/openebs/openebs/blob/master/adopters/users/mikroskeem/README.md)  | 
+| [Steve Fan](https://github.com/stevefan1999-personal) | [Agones - Game Servers on K8s](https://agones.dev/site/) | [English](https://github.com/openebs/openebs/blob/master/adopters/users/stevefan/README.md)  |