Adding a very simple projectionist config

.gitignore

@@ -51,3 +51,6 @@ log.txt.glab-cli
 
 # goreleaser struggled with this file being generated during the release build
 cyclonedx-go-go.json
+
+# projectionist.vim 
+.projections.json

.projections.json.example

@@ -0,0 +1,10 @@
+{
+  "*.go": {
+    "alternate": "{}_test.go",
+    "type": "source"
+  },
+  "*_test.go": {
+    "alternate": "{}.go",
+    "type": "test"
+  }
+}