Add PITCHME.md for gitpitch

PITCHME.md

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+#HSLIDE
+
+# Go plugins
+
+Gildas Chabot, leboncoin
+
+#HSLIDE
+
+## Demo!
+
+#HSLIDE
+
+- Released in 1.8
+- Add Go code at runtime
+- Works only on linux for now
+- Based on C's `dlfcn.h` (dynamic linking) with `cgo`
+  - See [`src/plugin/plugin_dlopen.go`](https://tip.golang.org/src/plugin/plugin_dlopen.go)
+
+#HSLIDE
+
+## Before
+
+- Add plugins at compile time (Caddy)
+- HTTP/RPC calls
+
+#HSLIDE
+
+## Now: Plugin side
+
+- Nothing special on the code of the plugin
+  - `-buildmode=plugin` build option
+- Creates a `.so`
+
+#HSLIDE
+
+## Now: Caller side
+
+- Only two functions:
+  - `Open(path string) (*Plugin, error)`
+  - `(p  *Plugin) Lookup(symName string) (Symbol, error)`
+- Two types:
+  - `Plugin`
+  - `Symbol`
+
+#HSLIDE
+
+## Example
+
+```
+p, err := plugin.Open("plugin.so")
+
+fs, err := p.Lookup("Transform")
+f, ok := fs.(func(image.Image) image.Image)
+
+vs, err := p.Lookup("Priority")
+v, ok = *vs.(*int)
+```
+
+#HSLIDE
+
+## Need?
+
+- Add ---
+
+#HSLIDE
+
+## Safety?
+
+- Plugin == safe?
+- Same rights as caller <!-- .element: class="fragment" -->
+- Check the sources of the plugins! <!-- .element: class="fragment" -->
+
+#HSLIDE
+
+## Stable?
+
+- What happens on `panic`?
+- --- <!-- .element: class="fragment" -->
+
+#HSLIDE
+
+## Go + C?
+
+- Go plugin used in C
+  - Already done with ---  <!-- .element: class="fragment" -->
+- C `.so` loaded in Go
+  - For now, error --- <!-- .element: class="fragment" -->
+
+#HSLIDE
+
+## Thank you
+
+Questions?
+
+Find the code and slides on Github: https://github.com/GildasCh/go-plugins-demo