Add main branch content for Session 3

session-3/backend/city_data_client.bal

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+import ballerina/http;
+import ballerina/io;
+
+final http:Client geoClient = check new ("https://public.opendatasoft.com/api/explore/v2.1/catalog/datasets");
+
+type CityDataResultsItem record {
+    int population;
+    string timezone;
+};
+
+type CityData record {
+    int total_count;
+    CityDataResultsItem[] results;
+};
+
+public function main() returns error? {
+    string city = "Miami";
+    string country = "United States";
+
+    CityData cityData = check geoClient->get(
+        string `/geonames-all-cities-with-a-population-500/records?refine=name:${
+            city}&refine=country:${country}`);
+    io:println(cityData);
+}

session-3/backend/connector/city-data-client/.devcontainer.json

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+{
+    "image": "ballerina/ballerina-devcontainer:2201.9.0",
+    "extensions": ["WSO2.ballerina"],
+}

session-3/backend/connector/city-data-client/.gitignore

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+# Ballerina generates this directory during the compilation of a package. 
+# It contains compiler-generated artifacts and the final executable if this is an application package.
+target/
+
+# Ballerina maintains the compiler-generated source code here.
+# Remove this if you want to commit generated sources.
+generated/
+
+# Contains configuration values used during development time.
+# See https://ballerina.io/learn/provide-values-to-configurable-variables/ for more details.
+Config.toml

session-3/backend/connector/city-data-client/Ballerina.toml

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+[package]
+org = "maryamzi"
+name = "city_data_client"
+version = "0.1.0"
+distribution = "2201.9.0"
+
+[build-options]
+observabilityIncluded = true

session-3/backend/connector/city-data-client/Dependencies.toml

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+# AUTO-GENERATED FILE. DO NOT MODIFY.
+
+# This file is auto-generated by Ballerina for managing dependency versions.
+# It should not be modified by hand.
+
+[ballerina]
+dependencies-toml-version = "2"
+distribution-version = "2201.9.0"
+
+[[package]]
+org = "ballerina"
+name = "auth"
+version = "2.11.0"
+dependencies = [
+	{org = "ballerina", name = "crypto"},
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.array"},
+	{org = "ballerina", name = "lang.string"},
+	{org = "ballerina", name = "log"}
+]
+
+[[package]]
+org = "ballerina"
+name = "cache"
+version = "3.8.0"
+dependencies = [
+	{org = "ballerina", name = "constraint"},
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "task"},
+	{org = "ballerina", name = "time"}
+]
+
+[[package]]
+org = "ballerina"
+name = "constraint"
+version = "1.5.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"}
+]
+
+[[package]]
+org = "ballerina"
+name = "crypto"
+version = "2.7.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "time"}
+]
+
+[[package]]
+org = "ballerina"
+name = "file"
+version = "1.9.0"
+dependencies = [
+	{org = "ballerina", name = "io"},
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "os"},
+	{org = "ballerina", name = "time"}
+]
+
+[[package]]
+org = "ballerina"
+name = "http"
+version = "2.11.0"
+dependencies = [
+	{org = "ballerina", name = "auth"},
+	{org = "ballerina", name = "cache"},
+	{org = "ballerina", name = "constraint"},
+	{org = "ballerina", name = "crypto"},
+	{org = "ballerina", name = "file"},
+	{org = "ballerina", name = "io"},
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "jwt"},
+	{org = "ballerina", name = "lang.array"},
+	{org = "ballerina", name = "lang.decimal"},
+	{org = "ballerina", name = "lang.int"},
+	{org = "ballerina", name = "lang.regexp"},
+	{org = "ballerina", name = "lang.runtime"},
+	{org = "ballerina", name = "lang.string"},
+	{org = "ballerina", name = "lang.value"},
+	{org = "ballerina", name = "log"},
+	{org = "ballerina", name = "mime"},
+	{org = "ballerina", name = "oauth2"},
+	{org = "ballerina", name = "observe"},
+	{org = "ballerina", name = "time"},
+	{org = "ballerina", name = "url"}
+]
+modules = [
+	{org = "ballerina", packageName = "http", moduleName = "http"},
+	{org = "ballerina", packageName = "http", moduleName = "http.httpscerr"}
+]
+
+[[package]]
+org = "ballerina"
+name = "io"
+version = "1.6.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.value"}
+]
+
+[[package]]
+org = "ballerina"
+name = "jballerina.java"
+version = "0.0.0"
+
+[[package]]
+org = "ballerina"
+name = "jwt"
+version = "2.11.0"
+dependencies = [
+	{org = "ballerina", name = "cache"},
+	{org = "ballerina", name = "crypto"},
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.int"},
+	{org = "ballerina", name = "lang.string"},
+	{org = "ballerina", name = "log"},
+	{org = "ballerina", name = "time"}
+]
+
+[[package]]
+org = "ballerina"
+name = "lang.__internal"
+version = "0.0.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.object"}
+]
+
+[[package]]
+org = "ballerina"
+name = "lang.array"
+version = "0.0.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.__internal"}
+]
+
+[[package]]
+org = "ballerina"
+name = "lang.decimal"
+version = "0.0.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"}
+]
+
+[[package]]
+org = "ballerina"
+name = "lang.int"
+version = "0.0.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.__internal"},
+	{org = "ballerina", name = "lang.object"}
+]
+
+[[package]]
+org = "ballerina"
+name = "lang.object"
+version = "0.0.0"
+
+[[package]]
+org = "ballerina"
+name = "lang.regexp"
+version = "0.0.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"}
+]
+
+[[package]]
+org = "ballerina"
+name = "lang.runtime"
+version = "0.0.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"}
+]
+
+[[package]]
+org = "ballerina"
+name = "lang.string"
+version = "0.0.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.regexp"}
+]
+
+[[package]]
+org = "ballerina"
+name = "lang.value"
+version = "0.0.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"}
+]
+
+[[package]]
+org = "ballerina"
+name = "log"
+version = "2.9.0"
+dependencies = [
+	{org = "ballerina", name = "io"},
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.value"},
+	{org = "ballerina", name = "observe"}
+]
+
+[[package]]
+org = "ballerina"
+name = "mime"
+version = "2.9.0"
+dependencies = [
+	{org = "ballerina", name = "io"},
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "lang.int"}
+]
+
+[[package]]
+org = "ballerina"
+name = "oauth2"
+version = "2.11.0"
+dependencies = [
+	{org = "ballerina", name = "cache"},
+	{org = "ballerina", name = "crypto"},
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "log"},
+	{org = "ballerina", name = "time"},
+	{org = "ballerina", name = "url"}
+]
+
+[[package]]
+org = "ballerina"
+name = "observe"
+version = "1.2.3"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"}
+]
+
+[[package]]
+org = "ballerina"
+name = "os"
+version = "1.8.0"
+dependencies = [
+	{org = "ballerina", name = "io"},
+	{org = "ballerina", name = "jballerina.java"}
+]
+
+[[package]]
+org = "ballerina"
+name = "task"
+version = "2.5.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "time"}
+]
+
+[[package]]
+org = "ballerina"
+name = "time"
+version = "2.4.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"}
+]
+
+[[package]]
+org = "ballerina"
+name = "url"
+version = "2.4.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"}
+]
+
+[[package]]
+org = "ballerinai"
+name = "observe"
+version = "0.0.0"
+dependencies = [
+	{org = "ballerina", name = "jballerina.java"},
+	{org = "ballerina", name = "observe"}
+]
+modules = [
+	{org = "ballerinai", packageName = "observe", moduleName = "observe"}
+]
+
+[[package]]
+org = "maryamzi"
+name = "city_data_client"
+version = "0.1.0"
+dependencies = [
+	{org = "ballerina", name = "http"},
+	{org = "ballerinai", name = "observe"}
+]
+modules = [
+	{org = "maryamzi", packageName = "city_data_client", moduleName = "city_data_client"}
+]
+

session-3/backend/connector/city-data-client/Package.md

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+# City Data Client
+
+Package for city data retrieval from https://public.opendatasoft.com/explore/dataset/geonames-all-cities-with-a-population-500/api/?disjunctive.country.