Enhance "A Warm Welcome to ASN.1 and DER"

[pgporada]

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• Add a table of contents to the top of the doc
• Add a table containing the bit value to constructed vs primitive
• Add boolean to Encoding of specific types. The Layman's Guide doesn't and I needed to figure it out today. I had to go back to X.690 (07/02).
• Clarify what the high bit vs low bits are.
• Add a picture/diagram explaining how to read parse a byte. Example:

Context Specific
| Context Specific
| | Primitive
| | | Encoded tag values
| | | |-------|
| | | |
8 7 6 5 4 3 2 1
1 0 0 0 0 0 0 1

= 129
which in hex is 0x81
and when looking at the CRL IssuerDistributionPoint flag onlyContainsUserCerts: 30038101FF

		RFC 5280 Section 5.2.5

		IssuingDistributionPoint ::= SEQUENCE {
			distributionPoint          [0] DistributionPointName OPTIONAL,
			onlyContainsUserCerts      [1] BOOLEAN DEFAULT FALSE,
			onlyContainsCACerts        [2] BOOLEAN DEFAULT FALSE,
			...
		}

I can tell that the onlyContainsUserCerts flag is set and nothing else is.