Merge branch 'integrations-developer-docs' into 'master'

Add development guide for integrations

See merge request gitlab-org/gitlab!80931

doc/.vale/gitlab/Uppercase.yml

@@ -51,6 +51,7 @@ exceptions:
   - EKS
   - ELB
   - EOL
+  - EWM
   - EXIF
   - FAQ
   - FIDO
@@ -144,6 +145,7 @@ exceptions:
   - RSA
   - RDS
   - RSS
+  - RTC
   - RVM
   - SAAS
   - SAML
@@ -171,6 +173,7 @@ exceptions:
   - SSH
   - SSL
   - SSO
+  - STI
   - SVG
   - SVN
   - TCP

doc/.vale/gitlab/spelling-exceptions.txt

@@ -229,6 +229,7 @@ Gemfile
 Gemnasium
 Gemojione
 Getter
+getters
 Getters
 gettext
 Git
@@ -576,6 +577,7 @@ sharded
 sharding
 shfmt
 Shibboleth
+Shimo
 Shopify
 Sidekiq
 Silverlight

doc/development/index.md

@@ -275,6 +275,7 @@ See [database guidelines](database/index.md).
 
 ## Integration guides
 
+- [Integrations development guide](integrations/index.md)
 - [Jira Connect app](integrations/jira_connect.md)
 - [Security Scanners](integrations/secure.md)
 - [Secure Partner Integration](integrations/secure_partner_integration.md)