doc: contribute page (#1947)

Signed-off-by: Yvonnick Esnault <yvonnick.esnault@corp.ovh.com>

LICENSE

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-Copyright (c) 2013-2017, OVH SAS.
+Copyright (c) 2013-2018, OVH SAS.
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without

docs/content/contribute/_index.md

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++++
+title = "Opensource / Contribute"
+weight = 7
+
++++
+
+## Roadmap
+
+See https://github.com/ovh/cds/blob/master/ROADMAP.md
+
+## Contact us
+
+* Benjamin COENEN - [@BnJ25](https://twitter.com/BnJ25)
+* François SAMIN - [@francoissamin](https://twitter.com/francoissamin)
+* Steven GUIHEUX - [@sguiheux](https://twitter.com/sguiheux)
+* Yvonnick ESNAULT - [@yesnault](https://twitter.com/yesnault)
+
+A remark / question / suggestion, feel free to join us on https://gitter.im/ovh-cds/Lobby
+
+All CDS Contributors: https://github.com/ovh/cds/graphs/contributors
+
+## Found a bug?
+
+Feel free to open an issue on https://github.com/ovh/cds/issues
+
+## Documentation 
+
+Documentation https://ovh.github.io/cds is generated with Hugo. Source are under https://github.com/ovh/cds/tree/master/docs/content
+
+### Write / Generate / Test documentation
+
+* Download release Hugo v32.4 https://github.com/gohugoio/hugo/releases/tag/v0.32.4 - put hugo binary in your PATH
+* Download CDS Binaries: cdsctl, engine, worker from https://github.com/ovh/cds/releases/latest 
+* Clone CDS repository: git clone https://github.com/ovh/cds.git inside ${CDS_SOURCES}
+* Generate documentation with Hugo
+
+```bash
+cd ${CDS_SOURCES}/docs/content/cli
+rm -rf cdsctl engine worker; 
+cdsctl doc  # generate cdsctl documentation inside ${CDS_SOURCES}/docs/content/cli/cdsctl
+engine doc  # generate engine documentation
+worker doc  # generate worker documentation
+cd ${CDS_SOURCES}/docs
+hugo server
+```
+* go to http://localhost:1313/cds/