Add example queries

Author: rportugal

doc/example_queries/01_basic_query.graphql

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+{
+  person(personID: 4) {
+    name
+  }
+}

doc/example_queries/02_nested_fields.graphql

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+{
+  person(personID: 4) {
+    name
+    gender
+    homeworld {
+      name
+    }
+  }
+}

doc/example_queries/03_nested_fields.graphql

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+{
+  person(personID: 4) {
+    name
+    gender
+    homeworld {
+      name
+    }
+    starshipConnection {
+      edges {
+        node {
+          id
+          manufacturers
+        }
+      }
+    }
+  }
+}

doc/example_queries/04_all_starships.graphql

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+# GraphQL server handles pagination on this example
+{
+  allStarships {
+    edges {
+      node {
+        id
+      }
+    }
+  }
+}

doc/example_queries/05_argument.graphql

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+{
+  allStarships(first: 7) {
+    edges {
+      node {
+        id
+        name
+        model
+        costInCredits
+        pilotConnection {
+          edges {
+            node {
+              name 
+              homeworld {
+                name
+              }               
+            }
+          }
+        }
+      }
+    }
+  }
+}

doc/example_queries/06_fragments.graphql

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+{
+  allStarships(first: 7) {
+    edges {
+      node {
+        id
+        name
+        model
+        costInCredits
+        pilotConnection {
+          edges {
+            node {
+              ...pilotFragment
+            }
+          }
+        }
+      }
+    }
+  }
+}
+
+fragment pilotFragment on Person {
+  name
+  homeworld { name }
+}

doc/example_queries/07_fragments.graphql

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+{
+  allStarships(first: 7) {
+    edges {
+      node {
+        ...starshipFragment
+      }
+    }
+  }
+}
+
+fragment starshipFragment on Starship {
+  id
+  name
+  model 
+  costInCredits
+  pilotConnection { edges { node { ...pilotFragment }}}
+}
+fragment pilotFragment on Person {
+  name
+  homeworld { name }
+}

doc/example_queries/08_introspection.graphql

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+{
+  __type(name: "Person") {
+    name 
+    fields {
+      name 
+      description
+      type { name }
+    }
+  }
+}