Add getting started with TCM tutorial

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

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+credentials:
+  users:
+    guest:
+      roles: [super]
+groups:
+  group-001:
+    replicasets:
+      replicaset-001:
+        replication:
+          failover: manual
+        leader: instance-001
+        instances:
+          instance-001:
+            iproto:
+              listen:
+              - uri: '127.0.0.1:3301'
+              advertise:
+                client: '127.0.0.1:3301'
+          instance-002:
+            iproto:
+              listen:
+              - uri: '127.0.0.1:3302'
+              advertise:
+                client: '127.0.0.1:3302'
+          instance-003:
+            iproto:
+              listen:
+              - uri: '127.0.0.1:3303'
+              advertise:
+                client: '127.0.0.1:3303'

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

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+instance-001:
+instance-002:
+instance-003:

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

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+config:
+  etcd:
+    endpoints:
+    - http://localhost:2379
+    prefix: /default

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

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+instance-001:
+instance-002:
+instance-003:

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

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+function create_space()
+    box.schema.space.create('bands')
+    box.space.bands:format({
+        { name = 'id', type = 'unsigned' },
+        { name = 'band_name', type = 'string' },
+        { name = 'year', type = 'unsigned' }
+    })
+    box.space.bands:create_index('primary', { type = "tree", parts = { 'id' } })
+    box.schema.user.grant('guest', 'read,write,execute', 'universe')
+end
+
+function load_data()
+    box.space.bands:insert { 1, 'Roxette', 1986 }
+    box.space.bands:insert { 2, 'Scorpions', 1965 }
+    box.space.bands:insert { 3, 'Ace of Base', 1987 }
+end
+
+function select_data()
+    box.space.bands:select { 3 }
+end