Created Error reporting to sentry (markdown)

Error-reporting-to-sentry.md

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+Since [https://github.com/seaweedfs/seaweedfs/commit/953f5713490343f3cb4d36eb17bae9e8716068b4](probably 3.65) release will be possible to send errors to sentry.
+
+To enable reporting some environment variables must be set
+* SENTRY_DSN (from project settings)
+* SENTRY_ENVIRONMENT (production, prod, test or whatever is used in organization)
+* SENTRY_RELEASE (weed@3.64)
+
+No other settings involved at this moment.
+
+SENTRY_DSN is the only required option and could be obtained from project settings.
+
+SENTRY_ENVIRONMENT and SENTRY_RELEASE may be empty or not set at all.
+Assign it to what match your organization's flow.