Update basic Fuchsia building docs

Bug: None
Change-Id: I721c75e75ae0ec95667749f673578221747cbbea
Reviewed-on: https://chromium-review.googlesource.com/1244156
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594085}
diff --git a/docs/README.md b/docs/README.md
index 7a36442..ffe325ae 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -48,6 +48,8 @@
     (on a Linux host)
 *   [Cast for Android Build Instructions](android_cast_build_instructions.md) -
     Cast for Android (on a Linux host)
+*   [Fuchsia Build Instructions](fuchsia_build_instructions.md) - Fuchsia target
+    (on a Linux host)
 *   [iOS Build Instructions](ios/build_instructions.md) - iOS target (on a MacOS
     host)
 *   [Chrome OS Build Instructions](chromeos_build_instructions.md) - Chrome OS