src/Pure/README

added General;

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−                        Pure: The Pure Isabelle System
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−This directory contains the ML source files for Pure Isabelle, which
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−is the basis for all object-logics:
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−  IsaMakefile	compiles the Pure system (use isatool make)
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−  ML-Systems/   compatibility files for various ML systems
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−  General/	general tools
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−  Syntax/     	the syntax module
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−  Thy/          the theory file parser and loader
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−  ./		the actual meta logic implementation (see ROOT.ML)
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−Isabelle programmers may want to have a look at the following generic
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−modules:
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−  Library	basic library (see library.ML)
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−  TableFun	efficient tables (see General/table.ML)
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−  Seq		unbounded sequences (see General/seq.ML)
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−  Pretty	pretty printing module (see Syntax/pretty.ML)
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−  Scan		scanner toolbox (see Syntax/scan.ML)
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−  Source	co-algebraic data sources (see Syntax/source.ML)
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−  Symbol	generalized characters (see Syntax/symbol.ML)
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−  Path		abstract algebra of file paths (see General/path.ML)
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−  File		file system operations (see General/file.ML)
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−  NameSpace	hierarchically structured name spaces (see General/name_space.ML)