first pass at intro

Signed-off-by: Todd Baert <[email protected]>

web-docs/intro.md

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+# What is flagd?
+
+_flagd_ is a _feature flag evaluation engine_.
+You can think of it as the "guts" of a full-featured flag management solution.
+It allows you to dynamically evaluate feature flags.
+
+With flagd you can:
+
+* modify flags in real time
+* define flags of various types (boolean, string, number, JSON)
+* use context-sensitive rules to target specific users or user-traits
+* perform pseudorandom assignments for experimentation
+* perform progressive roll-outs of new features
+* aggregate flag definitions from multiple sources 
+
+It doesn't include a UI, management console or a persistence layer.
+It's configurable entirely via a POSIX-style CLI.
+Thanks to it's minimalism, it's _extremely flexible_; you can run flagd as a sidecar alongside your application, or as a central service evaluating thousands of flags per second.