Add extracted tools: CitrineOS, OpenOCPP, ShapeShifter

- CitrineOS core extracted (CSMS OCPP 2.0.1)
- OpenOCPP extracted (firmware OCPP 1.6J/2.0.1)
- ShapeShifter library installed (pip install -e)
- ShapeShifter specification extracted
- EVerest extracted

TODO updated with progress

tools/EVerest-main/docs/source/explanation/high-level-overview.rst

@@ -0,0 +1,77 @@
+.. exp_high_level_overview:
+
+##############################
+High-Level Overview of EVerest
+##############################
+
+EVerest is the open source firmware stack for EV charging stations. By digitally abstracting
+the complexity of multiple standards and use cases, EVerest runs on any device, from unmanaged
+AC home chargers to complex multi-EVSE satellite public DC charging stations with battery and
+solar support. EVerest supports all the standards and protocols needed for standards-compliant,
+interoperable and secure charging. In other words, EVerest does the hard work of translating
+standards into working code to ensure that every car works with every charger with every
+charging app and network.
+
+Key features of EVerest
+========================
+
+All in all, you can expect the following:
+
+* Modular and extensible architecture
+* Support for AC and DC charging
+* Support for EV charging protocols
+    * OCPP 1.6, OCPP 2.0.1 and OCPP 2.1
+    * ISO 15118-2, -3 and -20
+    * IEC 61851
+    * DIN SPEC 70121
+* Ready-to-use hardware drivers for many compatible hardware components 
+    * BSPs for charge controllers
+    * Powermeters
+    * Isolation monitors
+    * DC Power supplies
+    * RFID/NFC readers
+    * Payment terminals
+* Energy management implementations and API
+* Standardized and stable APIs to allow easy integrations
+* Bring-up modules for custom hardware testing and integration
+* Ensured standards compliance
+* OTA service to keep EV chargers up-to-date
+* Security best practices following OpenSSF
+* ISO / IEC 5230 open source license compliance
+* Secure communication channels through TPM
+* Yocto support for custom embedded Linux images
+
+EVerest Architecture
+=====================
+
+EVerest contains a rich set of modules that can be combined to build a full EV charging station software stack.
+The architecture is modular and based on loosely coupled components that communicate via MQTT.
+
+.. image:: images/0-2-everest-top-level-diagram-module-communication.png
+
+Each module runs as an independent process and communicates with other modules via well-defined interfaces.
+This allows module to subscribe to variables published by other modules and to call commands provided by other modules.
+
+A more detailed explanation of the EVerest architecture and module concept can be found in the
+explaination about :doc:`EVerest modules in detail </explanation/detail-module-concept>`.
+
+Hardware Requirements
+=============================
+
+EVerest can run on any Linux-based operating system that comes with the required dependencies.
+Our (strong) recommendation is Yocto.
+Find more information on how to set up your Yocto-based environment in the respective
+:doc:`EVerest Linux and Yocto guides </explanation/linux-yocto/index>`.
+
+The hardware requirements to run EVerest very much depend on the use case and the modules
+that are used in the specific scenario. As a general guideline, the following minimum
+requirements should be met:
+
+* CPU: minimum imx6ULL or comparable, recommended is imx93 or AM62x
+* RAM: minimum of 512 MB, recommended is 1 GB or more
+* Flash: minimum of 1 GB, recommended is 4 GB or more
+
+Getting Started
+=====================
+
+Please refer to the :doc:`Quick Start Guides </how-to-guides/getting-started/get-started-sw>` to get started with EVerest.