Create rule S7086: Template definition should be instantiable

rules/S7086/cfamily/metadata.json

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+{
+  "title": "FIXME",
+  "type": "CODE_SMELL",
+  "status": "ready",
+  "remediation": {
+    "func": "Constant\/Issue",
+    "constantCost": "5min"
+  },
+  "tags": [
+  ],
+  "defaultSeverity": "Major",
+  "ruleSpecification": "RSPEC-7086",
+  "sqKey": "S7086",
+  "scope": "All",
+  "defaultQualityProfiles": ["Sonar way"],
+  "quickfix": "unknown",
+  "code": {
+    "impacts": {
+      "MAINTAINABILITY": "HIGH",
+      "RELIABILITY": "MEDIUM",
+      "SECURITY": "LOW"
+    },
+    "attribute": "CONVENTIONAL"
+  }
+}

rules/S7086/cfamily/rule.adoc

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+FIXME: add a description
+
+// If you want to factorize the description uncomment the following line and create the file.
+//include::../description.adoc[]
+
+== Why is this an issue?
+
+FIXME: remove the unused optional headers (that are commented out)
+
+//=== What is the potential impact?
+
+== How to fix it
+//== How to fix it in FRAMEWORK NAME
+
+=== Code examples
+
+==== Noncompliant code example
+
+[source,cpp,diff-id=1,diff-type=noncompliant]
+----
+FIXME
+----
+
+==== Compliant solution
+
+[source,cpp,diff-id=1,diff-type=compliant]
+----
+FIXME
+----
+
+//=== How does this work?
+
+//=== Pitfalls
+
+//=== Going the extra mile
+
+
+//== Resources
+//=== Documentation
+//=== Articles & blog posts
+//=== Conference presentations
+//=== Standards
+//=== External coding guidelines
+//=== Benchmarks

rules/S7086/metadata.json

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+{
+}