add document defining an OpenTelemetry Collector

specification/collector/README.md

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+# OpenTelemetry Collector
+
+The goal of this document is for users to be able to easily switch between
+OpenTelemetry Collector Distros while also ensuring that components produced by
+the OpenTelemetry Collector SIG is able to work with any vendor who claims
+support for an OpenTelemetry Collector.
+
+- An OpenTelemetry Collector _MUST_ accept as OpenTelemetry Collector Configuration
+  file.
+- An OpenTelemetry Collector _MUST_ be able to be compiled with any and all
+  additional Collector components that the user wishes to include.
+
+## OpenTelemetry Collector Configuration file
+
+## OpenTelemetry Collector components
+
+For a library to be considered an OpenTelemetry Collector component, it _MUST_
+implement the [Component interface](https://github.com/open-telemetry/opentelemetry-collector/blob/main/component/component.go)
+defined in the [opentelemetry-collector repository](https://github.com/open-telemetry/opentelemetry-collector).
+repository.
+
+## OpenTelemetry Collector Distribution
+
+An OpenTelemetry Collector Distribution (Distro) is a compiled instance
+of an OpenTelemetry Collector with a specific set of components and features.