Add README

Author: MMulthaupt

README.md

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+## process_exporter
+
+Makes available the following metrics for Prometheus for processes matching a given name:
+
+- CPU usage
+- RAM usage
+- Swap usage
+- Disk IO (bytes)
+- Disk IO (count)
+
+### Building
+
+```sh
+./build.sh
+```
+
+### Usage
+
+```sh
+./process_exporter -namespace # Prometheus metric namespace
+                   -binary # Name of binary to monitor
+                   -nameflag # Infer value of "name"-label from value of this command line flag of monitored process
+                   -port # Port to listen on for request (default: 80)
+                   -interval # Interval between metrics being refreshed (default: 10 seconds)
+```
+
+### TODO
+
+- Network IO.