README: add local development doc and agola demo link

README.md

@@ -1,3 +1,12 @@
-## Agola
+# Agola
 
 CI/CD redefined
+
+## Try it
+
+See [the agolademo example](https://agola.io/tryit)
+
+
+## Local development
+
+See [how to develop agola](doc/devel.md)

doc/devel.md

@@ -0,0 +1,38 @@
+### Local development
+
+#### Start the web interface
+
+* Clone the [agola-web repository](https://github.com/agola-io/agola-web)
+
+For the first time you'll need the `vue cli` and its services installed as global modules:
+
+```
+npm install -g @vue/cli @vue/cli-service-global
+```
+
+Inside the `agola-web` repository run:
+
+```
+npm install
+npm run serve
+```
+
+### Build the agola binary
+
+```
+make
+```
+
+### Start the agola server
+
+* Copy the `example/config.yml` where you prefer
+
+```
+./bin/agola serve --toolbox-path $PWD/bin/agola-toolbox --embedded-etcd --config /path/to/your/config.yml --components all-base,executor
+```
+
+or use an external etcd (set it in the config.yml):
+
+```
+./bin/agola serve --toolbox-path $PWD/bin/agola-toolbox --config /path/to/your/config.yml --components all-base,executor
+```