Credentials: add sample

doc/code_snippets/snippets/config/instances.enabled/credentials/config.yaml

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+credentials:
+  users:
+    admin:
+      password: 'T0p_Secret_P@$$w0rd'
+      roles: [ super ]
+    replicator:
+      password: 'topsecret'
+      roles: [ replication ]
+    storage:
+      password: 'secret'
+      roles: [ sharding ]
+    testuser:
+      password: '123456'
+      privileges:
+      - permissions: [ session ]
+      - permissions: [ execute ]
+        lua_eval: true
+      - permissions: [ read ]
+        spaces: [ writers, books ]
+      - permissions: [ read, write ]
+        spaces: [ writers ]
+
+
+groups:
+  group001:
+    replicasets:
+      replicaset001:
+        instances:
+          instance001:
+            iproto:
+              listen:
+              - uri: '127.0.0.1:3301'
+
+# Load sample data
+app:
+  file: 'myapp.lua'

doc/code_snippets/snippets/config/instances.enabled/credentials/instances.yml

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+instance001:

doc/code_snippets/snippets/config/instances.enabled/credentials/myapp.lua

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+function create_spaces()
+    box.schema.space.create('writers')
+    box.space.writers:format({
+        { name = 'id', type = 'unsigned' },
+        { name = 'name', type = 'string' }
+    })
+    box.space.writers:create_index('primary', { parts = { 'id' } })
+
+    box.schema.space.create('books')
+    box.space.books:format({
+        { name = 'id', type = 'unsigned' },
+        { name = 'title', type = 'string' },
+        { name = 'author_id', foreign_key = { space = 'writers', field = 'id' } },
+    })
+    box.space.books:create_index('primary', { parts = { 'id' } })
+end
+
+function load_data()
+    box.space.writers:insert { 1, 'Leo Tolstoy' }
+    box.space.writers:insert { 2, 'Fyodor Dostoevsky' }
+    box.space.writers:insert { 3, 'Alexander Pushkin' }
+
+    box.space.books:insert { 1, 'War and Peace', 1 }
+    box.space.books:insert { 2, 'Crime and Punishment', 2 }
+    box.space.books:insert { 3, 'Eugene Onegin', 3 }
+end