Add dummy C++ project for interactive tests

Author: sebastiansturm

sample-project/compile_commands.json

@@ -0,0 +1,10 @@
+[
+  {
+    "file": "some_file.cpp",
+    "command": "clang++ -std=c++17 -x c++ -g some_file.cpp -c -o /tmp/some_file.o"
+  },
+  {
+    "file": "some_other_file.cpp",
+    "command": "clang++ -std=c++17 -x c++ -g some_other_file.cpp -c -o /tmp/some_other_file.o"
+  }
+]

sample-project/some_file.cpp

@@ -0,0 +1,9 @@
+struct SomeSymbol {
+   int with_member;
+};
+
+namespace some_namespace {
+using some_other_symbol = SomeSymbol;
+
+int some_function(int) { return 0; }
+}  // namespace some_namespace

sample-project/some_other_file.cpp

@@ -0,0 +1,5 @@
+struct AlsoASymbol {
+   int with_member_too;
+};
+
+bool some_other_function(AlsoASymbol& x) { return true; }