TF-RMM Release v0.1.0

This is the first external release of TF-RMM and provides a reference
implementation of Realm Management Monitor (RMM) as specified by the
RMM Beta0 specification[1].

The `docs/readme.rst` has more details about the project and
`docs/getting_started/getting-started.rst` has details on how to get
started with TF-RMM.

[1] https://developer.arm.com/documentation/den0137/1-0bet0/?lang=en

Signed-off-by: Soby Mathew <soby.mathew@arm.com>
Change-Id: I205ef14c015e4a37ae9ae1a64e4cd22eb8da746e
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..b994ee1
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,10 @@
+[submodule "mbedtls"]
+	path = ext/mbedtls
+	url = https://github.com/ARMmbed/mbedtls.git
+	ignore = dirty
+[submodule "ext/qcbor"]
+	path = ext/qcbor
+	url = https://github.com/laurencelundblade/QCBOR.git
+[submodule "ext/t_cose"]
+	path = ext/t_cose
+	url = https://github.com/matetothpal/t_cose.git