adding schema and updating readme

Author: omursahin

README.md

@@ -70,7 +70,7 @@ For simplicity, all schemas are also available as JSON/YML files under the folde
 > **IMPORTANT**: More details (e.g., #LOCs and used databases) on these APIs can be found [in this table](statistics/table_emb.md).
 
 
-### REST: Java/Kotlin (25)
+### REST: Java/Kotlin (26)
 
 * **Bibliothek** (MIT), [jdk_17_gradle/cs/rest/bibliothek](jdk_17_gradle/cs/rest/bibliothek), from [https://github.com/PaperMC/bibliothek](https://github.com/PaperMC/bibliothek)
 
@@ -96,6 +96,8 @@ For simplicity, all schemas are also available as JSON/YML files under the folde
 
 * **News** (LGPL), [jdk_8_maven/cs/rest/artificial/news](jdk_8_maven/cs/rest/artificial/news), from [https://github.com/arcuri82/testing_security_development_enterprise_systems](https://github.com/arcuri82/testing_security_development_enterprise_systems)
 
+* **Ohsome API** (MIT), [jdk_17_maven/cs/rest/ohsome-api](jdk_17_maven/cs/rest/ohsome-api), from [https://github.com/GIScience/ohsome-api](https://github.com/GIScience/ohsome-api)
+
 * **OCVN** (MIT), [jdk_8_maven/cs/rest-gui/ocvn](jdk_8_maven/cs/rest-gui/ocvn), from [https://github.com/devgateway/ocvn](https://github.com/devgateway/ocvn)
 
 * **Payments Public API** (MIT), [jdk_11_maven/cs/rest/pay-publicapi](jdk_11_maven/cs/rest/pay-publicapi), from [https://github.com/alphagov/pay-publicapi](https://github.com/alphagov/pay-publicapi)