Add Install instructions (fix #2)

README.md

@@ -1,2 +1,18 @@
 # protoc-gen-gotemplate
 :open_file_folder: protocol generator + golang text/template (protobuf)
+
+Generic protocol buffer generator backed by Golang's [text/template](https://golang.org/pkg/text/template).
+
+## Usage
+
+See [examples](./examples).
+
+## Install
+
+* Install the **Go** compiler and tools from https://golang.org/doc/install
+* Install **protobuf**: `go get -u github.com/golang/protobuf/{proto,protoc-gen-go}`
+* Install **protoc-gen-gotemplate**: `go get -u github.com/moul/protoc-gen-gotemplate`
+
+## License
+
+MIT