Move some basic early process init into Service Manager

services/service_manager/embedder/README.md

Index: services/service_manager/embedder/README.md
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+# Service Manager Embedder API
+
+The Service Manager is a library for opaquely managing service process launch,
+sandboxing, and lifetime; and for brokering Mojo interface connections among
+services.
+
+The Service Manager must be configured with a static set of declarative service
+definitions. The embedder API provides a means of embedding core Service Manager
+functionality into a standalone executable, delegating configuration and
+assorted implementation details to the embedder.
+
+As one example, the Content layer of Chromium embeds the Service Manager via
+this API, and there it's used [WIP] to drive all process management and IPC
+setup across the system.
+
+This API is a work in progress, and more details will be documented here as the
+API is stabilized.