minor #17062 Update README.markdown (94noni)

This PR was squashed before being merged into the 4.4 branch.

Discussion
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Update README.markdown

Ref the top of the [symfony/symfony readme](https://github.com/symfony/symfony)
Adds a faster access

Commits
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9789991 Update README.markdown

Author: javiereguiluz

README.markdown

@@ -11,6 +11,10 @@
     Online version
   </a>
   <span> | </span>
+  <a href="https://symfony.com/components">
+    Components
+  </a>
+  <span> | </span>
   <a href="https://symfonycasts.com">
     Screencasts
   </a>