Add README for locustdb-compression-utils

locustdb-compression-utils/README.md

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+# LocustDB Compression Utils
+
+Collection of utils for compressing a series of values. 
+
+## XOR float compression
+
+One of compression algorithms implemented is a variant of the XOR float compression algorithm described in [Gorilla: A Fast, Scalable, In-Memory Time Series Database](https://www.vldb.org/pvldb/vol8/p1816-teller.pdf). The "gorilla_time" example program creates visualizations of the compression algorithm. You can run the visualization with:
+
+```bash
+cargo run --example gorilla_time -- --verbose
+```
+
+Run the following command to see more options:
+
+```bash
+cargo run --example gorilla_time -- --help
+```