Squashed 'third_party/osqp/' content from commit 33454b3e23

Change-Id: I056df0582ca06664e86554c341a94c47ab932001
git-subtree-dir: third_party/osqp
git-subtree-split: 33454b3e236f1f44193bfbbb6b8c8e71f8f04e9a
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/docs/interfaces/rlang.rst b/docs/interfaces/rlang.rst
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+.. _rlang_interface:
+
+
+R
+==
+
+The R interface is officially on CRAN and documented `here <https://cran.r-project.org/web/packages/osqp/>`_.