added berkeley softfloat library submodule

diff --git a/.gitmodules b/.gitmodules
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+[submodule "berkeley-softfloat-3"]
+       path = berkeley-softfloat-3
+       url = https://github.com/ucb-bar/berkeley-softfloat-3

diff --git a/README.md b/README.md
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+++ b/README.md
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+# IEEE754 Floating-Point ALU, in nmigen
+
+This project implements a pipelined IEEE754 floating-point ALU that
+supports FP16, FP32 and FP64.

diff --git a/berkeley-softfloat-3 b/berkeley-softfloat-3
new file mode 160000 (submodule)
index 0000000..b64af41
--- /dev/null
+++ b/berkeley-softfloat-3
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+Subproject commit b64af41c3276f97f0e181920400ee056b9c88037