Added initial version of README under scripts directory

scripts/README.md

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+This directory contains number of scripts aimed to help **build, run and test** OSv images. 
+
+**DISCLAIMER**: Please note that some of the scripts were written years ago and are no longer maintained and potentially obsolete. 
+Please look at the creation date as a good indicator. When in doubt on how to use any of them post a question on [OSV mailing list](https://groups.google.com/forum/#!forum/osv-dev).
+
+# Setup
+* **setup.py** - Python script that detects the type of Linux distribution and installs all necessary packages to build and run OSv; currently following Linux distributions are supported:
+  * Debian
+  * Fedora
+  * Ubuntu
+  * Linux Mint
+  * RHEL
+
+Please note that only Fedora and Ubuntu are actively maintained and tested. Linux Mint was alre recenty added so there is good chance it might be up to date.  
+
+# Building OSv
+* **build** - main shell script that orchestrates building OSv images by delegating to the main [Makefile](https://github.com/cloudius-systems/osv/blob/master/Makefile) 
+  to build kernel and number of Python scripts like [module.py](https://github.com/cloudius-systems/osv/blob/master/scripts/module.py) to 
+  build application and fuse together into a final image ```./build/$(arch)/usr.img```; for details how to use run ```./scripts/build --help```
+* **module.py** - Python script that iterates over all passed in modules and/or apps to the main build, resolves any dependant ones, 
+  invokes their make files and concatenates final build manifest (```./build/$(arch)/usr.manifest``` - list of OSv/host path pairs)
+* **manifest_common.py** - 
+* **upload_manifest.py** - 
+* **gen-rofs-img.py** - 
+* **mkbootfs.py** - 
+* **imgedit.py** - 
+* **export_manifest.py** - 
+* **nbd_client.py** - 
+
+# Running OSv
+* **run.py** - main script intended to run the OSv image built using scripts/build; please run ```./script/run.py --help``` for details
+* **firecracker.py** - version of the run script intended to run the OSv image on firecracker; please run ```./script/firecracker.py --help``` for details
+
+# Testing OSv
+* **test.py** - main script intended to orchestrate running the OSv unit tests; invoked by build when run like so: ```./scripts/build check```; 
+  this script delegates to other Python scripts under scripts/tests
+* **loader.py**  - used by gdb to assist with debugging OSv (for details look at this [Wiki page](https://github.com/cloudius-systems/osv/wiki/Debugging-OSv))