Added json files from https://github.com/ghdl/ghdl-language-server repository.

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diff --git a/testsuite/pyunit/lsp/files/adder.vhdl b/testsuite/pyunit/lsp/files/adder.vhdl
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+
+entity adder is
+  -- `i0`, `i1`, and the carry-in `ci` are inputs of the adder.
+  -- `s` is the sum output, `co` is the carry-out.
+  port (i0, i1 : in bit; ci : in bit; s : out bit; co : out bit);
+end adder;
+
+architecture rtl of adder is
+begin
+  --  This full-adder architecture contains two concurrent assignments.
+  --  Compute the sum.
+  s <= i0 xor i1 xor ci;
+  --  Compute the carry.
+  co <= (i0 and i1) or (i0 and ci) or (i1 and ci);
+end rtl;
+