feat: added readme

Readme.md

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+# APM HUB
+
+APM Hub is a powerful tool designed to aggregate logs from various sources and provide a centralized location for querying them.
+
+It is able to integrate with the following sources:
+
+- Elastic search
+- Files
+- Kubernetes
+
+## Documentation
+
+Read the documentation at [https://docs.flanksource.com/apm-hub/overview/](https://docs.flanksource.com/apm-hub/overview/)
+
+## Samples
+
+Check out the samples directory for example configurations.
+
+## CLI
+
+**Usage**
+
+```bash
+apm-hub [command]
+```
+
+**Available Commands:**
+
+```
+  completion  Generate the autocompletion script for the specified shell
+  help        Help about any command
+  operator    Start the kubernetes operator
+  serve       Start the for querying the logs
+  version     Print the version of apm-hub
+
+Flags:
+      --db string             Connection string for the postgres database (default "DB_URL")
+      --db-log-level string    (default "warn")
+      --db-migrations         Run database migrations
+      --db-schema string       (default "public")
+  -h, --help                  help for apm-hub
+      --json-logs             Print logs in json format to stderr
+  -v, --loglevel count        Increase logging level
+
+Use "apm-hub [command] --help" for more information about a command.
+```