Add README.md

README.md

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+## Run
+
+Run with:
+
+```
+./buildAndRun.sh
+```
+
+To activate the plugins, move the `.so` files from the
+`plugins.available` directory to the `plugins` directory.
+
+## Todo
+
+- Malicious plugin -> read a folder and write to image
+  - Check source code?
+
+## Presentation
+
+- Add Go code at runtime
+- Works only on linux for now
+- Based on `dlfcn.h` (dynamic linking) with `cgo`
+  - See [`src/plugin/plugin_dlopen.go`](https://tip.golang.org/src/plugin/plugin_dlopen.go)
+
+- Only two functions: `Open(path string) (*Plugin, error)` and `(p
+  *Plugin) Lookup(symName string) (Symbol, error)`
+- Two types: `Plugin`, `Symbol`
+- Nothing special on the code of the plugin, only the
+  `-buildmode=plugin` build option
+
+Example (from [the doc](https://tip.golang.org/pkg/plugin/)):
+```
+p, err := plugin.Open("plugin_name.so")
+if err != nil {
+	panic(err)
+}
+v, err := p.Lookup("V")
+if err != nil {
+	panic(err)
+}
+f, err := p.Lookup("F")
+if err != nil {
+	panic(err)
+}
+*v.(*int) = 7
+f.(func())() // prints "Hello, number 7"
+```