Update readme

Author: alexbozhenko

04_data_structures/README.md

@@ -8,9 +8,4 @@ Description of the module from the official [csi page](https://bradfieldcs.com/c
 - [05 Exploring LevelDB](./05_levelDB/)
 - [06 Exploring Merkle Hash Trees](./06_merkle_hash_trees/)
 - [07 Implement an uncompressed Bitmap, and explore compression schemes](./07_roaring_bitmaps/)[]
-- [08 Exploring HyperLogLog for estimating set cardinality](./08_hyperLogLog/)
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+- [08 Exploring HyperLogLog for estimating set cardinality](./08_hyperLogLog/)

05_operating_systems/01_intro/README.md

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+No coding exercise for this class, just reading.

05_operating_systems/02_programs_and_processes/README.md

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+No coding exercise for this class, just reading.

05_operating_systems/README.md

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+Description of the module from the official [csi page](https://bradfieldcs.com/csi/):
+> Learning how best to utilize the systems that sit between our applications and our computer systems, covering topics such as memory virtualization, task scheduling, file systems, and OS-level concurrency primitives.
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+- [01 Introduction. Understanding primary responsibilities of an operating system](./01_intro/)
+- [02 Understanding processes and procces API](./02_programs_and_processes/)
+- [03 Process control and signals](./03_process_execution_and_scheduling/)
+- [04 Virtual memory](./04_virtual_memory/)
+- [05 Exploring various IPC mechanisms](./05_interprocess_comunication/)
+- [06 Exploring file systems and FUSE](./06_file_systems/)
+- [07 Exploring mechanism behind containers](./07_containers/)