Develop wiki - Installation (#202)

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docs/installation.md

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+# Installation as a JMeter library
+
+By default, the installation process will generate the JMeter plugin jar file. After cloning the repository, run the following command:
+
+```bash
+ mvn clean install -P plugin
+```
+or just:
+
+```bash
+ mvn clean install
+```
+
+Once the installation is complete, copy **target/kloadgen-<version>.jar** file to the `JMETER_HOME/lib/ext` directory.
+
+You are now ready to create a new test plan in JMeter. See the specific sections for details on how to set them:
+
+- [Producer configuration](producer-configuration.md#kafka-producer-sampler-configuration)
+- [Consumer configuration](producer-configuration.md#kafka-consumer-sampler-configuration)
+