Adds documentation for Go callgraph generation

Author: fastlag

internal/callgraph/language/golang/README.md

@@ -1 +1,22 @@
-# TODO: add docs to this readme on how we generate go CGs
+# Go CallGraph Generation
+
+Building callgraphs for Go is generally easy, but there are some caveats.
+If your project depends on building non-Go components then you need to manually build the project before building the callgraph.
+Once the project is built you can generate the callgraph with the following command:
+```shell
+debricked callgraph . 
+```
+
+And then upload it and scan it using:
+
+
+```shell
+debricked scan .
+```
+
+# Additional Information
+
+The callgraph generation depends only on internal functionality in the Go standard library, for more information about this and the implementation see: 
+https://cs.opensource.google/go/x/tools/+/refs/tags/v0.19.0:cmd/callgraph/main.go
+
+As always, callgraph cannot be expected to include all possible calls in your program and not all included calls are guaranteed to be reachable.