Merge pull request #211 from debricked/0-add-general-ra-readme

Add general callgraph readme

internal/callgraph/README.md

@@ -0,0 +1,35 @@
+# Callgraph Generation
+
+The Debricked CLI can generate static callgraphs for projects to enable reachability analysis for vulnerabilities.
+
+For the only currently supported language, Java, some setup is required for callgraph generation to work
+properly. For more information on this see the Language Support section below.
+
+## Language Support
+Debricked CLI callgraph generation currently only supports Java, the specific
+documentation for the Java callgraph generation can be
+found [here](https://github.com/debricked/cli/blob/main/internal/callgraph/language/java11/README.md).
+
+## Use
+
+To generate a callgraph for your project you can use the direct command:
+
+
+```shell
+debricked callgraph <path>
+```
+
+```shell
+debricked callgraph --help
+```
+
+Or you can enable it in your scan to add reachability analysis:
+
+```shell
+debricked scan --callgraph 
+```
+
+To analyze the generated callgraph it needs to be uploaded using the scan command, either with the 
+callgraph generation flag as above, or with an already generated call graph by omitting the flag.
+
+For more information see documentation on the specific langauge implementation or see full CLI documentation [here](https://docs.debricked.com/tools-and-integrations/cli/debricked-cli)