Update 'README.md'

README.md

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 # gocron-server
+Small job scheduling server/library based on [gocron](https://github.com/go-co-op/gocron). Besides providing cron-functionality it also offers a gRPC API to manually trigger the jobs.
 
+Sample config:
+```toml
+[server]
+host=":9092"
+
+# This unit will be executed every minute or can be manually triggered.
+[[unit]]
+name="echo"
+command="echo hello"
+cron="* * * * *"
+
+# This unit can only be manually triggered.
+[[unit]]
+name="notify"
+command="notify-send hello"
+```
+
+## Usage
+```sh
+go run cmd/main.go <job-definition-toml>
+# Example: go run cmd/main.go examples/config.toml
+```
+
+Jobs can also be defined using code by extending the server. For an example of extending the server see [this example](./examples/counter.go).