check in the Cargo.lock for b3sum

We'll need to make sure to update this when we do a version bump. Adding
an explicit `!Cargo.lock` line to b3sum/.gitignore helps with this, by
making sure Cargo.lock shows up by defauls in searches like:

    rg "1\.2\.0"

Closes https://github.com/BLAKE3-team/BLAKE3/issues/210.

2 files changed, 480 insertions, 0 deletions

diff --git a/b3sum/.gitignore b/b3sum/.gitignore
new file mode 100644
index 0000000..9da4a88
--- /dev/null
+++ b/b3sum/.gitignore
@@ -0,0 +1 @@
+!Cargo.lock
diff --git a/b3sum/Cargo.lock b/b3sum/Cargo.lock
new file mode 100644
index 0000000..79c117a
--- /dev/null
+++ b/b3sum/Cargo.lock
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