feat(docs): Hugo

Signed-off-by: pmikus <peter.mikus@protonmail.ch>
Change-Id: Id8b43ef1f31f39b19a0629c52581514fda278f3b

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+---
+bookHidden: true
+title: "Performance Triggers Design"
+---
+
+# Performance Triggers Design
+
+*Syntax*
+  trigger_keyword [{tag1} {tag2}AND{tag3} !{tag4} !{tag5}]
+
+*Inputs*
+  - trigger_keyword for vpp-* jobs: 'perftest'
+  - trigger_keyword for csit-* jobs: 'csit-perftest'
+  - tags: existing CSIT tags [4]_ i.e. ip4base, ip6base, iacldst, memif
+
+Set of default tags appended to user input, under control by CSIT
+  - always-on for vpp-csit*.job: 'mrr' 'nic_intel_x710-da2' '1t1c'
+  - if input with no tags, following set applied:
+     - 'mrrANDnic_intel-x710AND1t1cAND64bANDip4base'
+     - 'mrrANDnic_intel-x710AND1t1cAND78bANDip6base'
+     - 'mrrANDnic_intel-x710AND1t1cAND64bANDl2bdbase'
+
+Examples
+  input: 'perftest'
+    expanded: 'mrrANDnic_intel_x710-da2AND1t1cAND64bANDl2bdbase mrrANDnic_intel_x710-da2AND1t1cAND64bANDip4base mrrANDnic_intel_x710-da2AND1t1cAND78bANDip6base'
+  input: 'perftest l2bdbase l2xcbase'
+    expanded: 'mrrANDnic_intel_x710-da2ANDl2bdbase mrrANDnic_intel_x710-da2ANDl2xcbase'
+  input: 'perftest ip4base !feature'
+    expanded: 'mrrANDnic_intel_x710-da2ANDip4base' not 'feature'
+  input: 'perftest ip4base !feature !lbond_dpdk'
+    expanded: 'mrrANDnic_intel_x710-da2ANDip4base' not 'feature' not 'lbond_dpdk'
+  input: 'perftestxyx ip4base !feature !lbond_dpdk'
+    invalid: detected as error
+  input: 'perftestip4base !feature !lbond_dpdk'
+    invalid: detected as error
+  input: 'perftest ip4base!feature!lbond_dpdk'
+    invalid expand: 'mrrANDnic_intel_x710-da2ANDip4base!feature!lbond_dpdk'
+    execution of RobotFramework will fail
+
+Constrains
+  Trigger keyword must be different for every job to avoid running multiple jobs
+  at once. Trigger keyword must not be substring of job name or any other
+  message printed by JJB bach to gerrit message which can lead to recursive
+  execution.