Adds Command Line Referance and Explanation Sections

Initial Files are Added, content to be added in Version Specific Branches v2.2.1 and v3.1.1 which branches from this commit.

Signed-off-by: Ayan Sinha Mahapatra <ayansmahapatra@gmail.com>

Author: AyanSinhaMahapatra

docs/source/scancode-toolkit/cli-reference/help-text-options.rst

@@ -0,0 +1,2 @@
+Help text 
+=========

docs/source/scancode-toolkit/cli-reference/list-options.rst

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+All Available Options
+=====================

docs/source/scancode-toolkit/cli-reference/simple-examples.rst

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+A Simple Example
+================
+

docs/source/scancode-toolkit/cli-reference/synopsis.rst

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+Synopsis
+========
+
+

docs/source/scancode-toolkit/explanations/overview.rst

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+Overview
+========
+
+How does ScanCode work?
+-----------------------
+
+For license detection, ScanCode uses a (large) number of license texts and license detection 'rules' that are compiled in a search index. When scanning, the text of the target file is extracted and used to query the license search index and find license matches.
+
+For copyright detection, ScanCode uses a grammar that defines the most common and less common forms of copyright statements. When scanning, the target file text is extracted and 'parsed' with this grammar to extract copyright statements.
+
+Scan results are provided in various formats:
+
+- a JSON file simple or pretty-printed,
+- SPDX tag value or XML RDF formats,
+- CSV,
+- a simple unformatted HTML file that can opened in browser or as a spreadsheet.
+
+For each scanned file, the result contains:
+
+- its location in the codebase,
+- the detected licenses and copyright statements,
+- the start and end line numbers identifying where the license or copyright was found in the scanned file, and
+- reference information for the detected license.
+
+For archive extraction, ScanCode uses a combination of Python modules, 7zip and libarchive/bsdtar to detect archive types and extract these recursively.
+
+Several other utility modules are used such as libmagic for file and mime type detection.

docs/source/scancode-toolkit/misc/index.rst

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    :maxdepth: 2
 
    faq
-   help
    support
    perf_report
    plugin_arch