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Added the doc for the new container logging capability

Author: sreejithgs

docs/log-support.md

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+# Support for container logging
+
+Now, you can enable logging on NetScaler Observability Exporter according to different severity levels. These logs help in getting information about endpoint specific configuration.
+
+The following logging severity levels are supported and the default value is `INFO`.
+
+-  `NONE` : None of the messages are logged.
+-  `FATAL` : Only fatal messages are logged.
+-  `ERROR`:  Only fatal messages and error messages are logged.
+-  `INFO`:  Only fatal, error, and informational messages are logged.
+
+For Kubernetes YAML based deployments the default value is NONE. But, for Helm and OpenShift operator deployments of NetScaler Observability Exporter logging is enabled by default and set as INFO.
+
+You can configure logging using the environment variable `NSOE_LOG_LEVEL` while deploying NetScaler Observability Exporter for each endpoint.
+
+The following example shows how to configure the log level in the NetScaler Observability Exporter deployment YAML:
+
+         env:
+           - name: NSOE_LOG_LEVEL
+             value: "INFO"
+
+The following are the types of logs that you can get:
+
+-  NetScaler Observability Exporter configuration file errors and parsing errors.
+-  Endpoint (ElasticSearch, Splunk) status such as up or down.
+-  Endpoint specific configuration errors. For example, the message saying `Kafka topic is invalid`.
+-  NetScaler related configuration messages. For example, adding or deleting a NetScaler IP address.