Added Readme and app environment variables

Author: korir248

examples/web_app_graphql/.env.example.txt

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+DATABASE_URL=postgres://[username]:[password]@localhost/[database_name]
+MEILISEARCH_HOST=http://localhost:7700
+MEILISEARCH_API_KEY=[your-master-key]
+MIGRATIONS_DIR_PATH=migrations

examples/web_app_graphql/.gitignore

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+/target
+/Cargo.lock
+
+.env

examples/web_app_graphql/Readme.md

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+# Meilisearch example with graphql using `diesel`, `async_graphql` and `postgres`
+
+## Contents
+
+Setting up a graphql server using `async_graphql` and `actix-web`
+
+Using `diesel` to query the database
+
+Using `meilisearch-sdk` to search for records that match a given criteria
+
+## Running the example
+
+The meilisearch server needs to be running. You can run it by the command below
+
+```bash
+meilisearch --master-key <your master key>
+```
+
+Then you can run the application by simply running
+
+```bash
+cargo run --release
+```
+
+The above command will display a link to your running instance and you can simply proceed by clicking the link or navigating to your browser.
+
+### Running the resolvers
+
+On your browser, you will see a graphql playground in which you can use to run some queries
+
+You can use the `searchUsers` query as follows:
+
+```gpl
+query {
+  users{
+    search(queryString: "Eugene"){
+      lastName
+      firstName
+      email
+    }
+  }
+}
+```

examples/web_app_graphql/src/app_env_vars.rs

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+use serde::Deserialize;
+
+#[derive(Deserialize, Debug, Clone)]
+pub struct AppEnvVars {
+    pub meilisearch_api_key: String,
+    pub meilisearch_host: String,
+    pub database_url: String,
+    pub migrations_dir_path: String,
+}

examples/web_app_graphql/src/models.rs

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+use async_graphql::SimpleObject;
+use diesel::{Queryable, Selectable};
+use serde::{Deserialize, Serialize};
+
+use crate::schema::users;
+
+#[derive(SimpleObject, Deserialize, Serialize, Queryable, Selectable, Debug)]
+#[diesel(table_name = users)]
+pub struct User {
+    pub id: i32,
+    pub first_name: String,
+    pub last_name: String,
+    pub email: String,
+}

examples/web_app_graphql/src/schema.rs

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+// @generated automatically by Diesel CLI.
+
+diesel::table! {
+    users (id) {
+        id -> Int4,
+        first_name -> Varchar,
+        last_name -> Varchar,
+        email -> Varchar,
+    }
+}