Added table of contents.

Author: springcomp

proposals/README.md

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+# Proposals
+
+- [Accepted](./accepted)
+- [Draft](./draft)

proposals/accepted/README.md

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+# Accepted Proposals
+
+These are accepted proposals:
+
+- [JEP  1 - Nested Expressions](./jep-001-nested-expressions.md)
+- [JEP  3 - Functions](./jep-003-functions.md)
+- [JEP  4 - Pipes](./jep-004-pipes.md)
+- [JEP  5 - Array Slices](./jep-005-array-slices.md)
+- [JEP  6 - Improved Identifiers](./jep-006-improved-identifiers.md)
+- [JEP  7 - Filter Expressions](./jep-007-filter-expressions.md)
+- [JEP  8 - Exptype](./jep-008-exptype.md)
+- [JEP  9 - Improved Filters](./jep-009-improved-filters.md)
+- [JEP 10 - Slice Projections](./jep-010-slice-projections.md)
+- [JEP 12 - Raw String Literals](./jep-012-raw-string-literals.md)

proposals/draft/README.md

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+# Draft Proposals
+
+These are draf proposals:
+
+- [JEP 11 - Lexical Scoping](./jep-012-let-function.md)