Add initial workspace

Signed-off-by: Marcel Müller <neikos@neikos.email>

lints/dashmap-ref/README.md

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+# template
+
+### What it does
+
+### Why is this bad?
+
+### Known problems
+
+Remove if none.
+
+### Example
+
+```rust
+// example code where a warning is issued
+```
+
+Use instead:
+
+```rust
+// example code that does not raise a warning
+```