Added snippets for markdown-mode from Peng Deng.

snippets/text-mode/markdown-mode/+

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+#name : Unordered List
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
++ ${1:Text}
++$0

snippets/text-mode/markdown-mode/-

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+#name : Unordered List
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+- ${1:Text}
+-$0

snippets/text-mode/markdown-mode/_

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+#name : Emphasis
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+_${1:Text}_ $0

snippets/text-mode/markdown-mode/__

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+#name : Strong
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+**${1:Text}** $0

snippets/text-mode/markdown-mode/`

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+#name : Inline Code
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+\`${1:Code}\` $0

snippets/text-mode/markdown-mode/h1.1

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+#name : Header 1 (#)
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+# ${1:Header 1} #
+
+$0

snippets/text-mode/markdown-mode/h1.2

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+#name : Header 1 (=)
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+${1:Header 1}
+${1:$(make-string (string-width text) ?\=)}
+
+$0

snippets/text-mode/markdown-mode/h2.1

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+#name : Header 2 (##)
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+## ${1:Header 1} ##
+
+$0

snippets/text-mode/markdown-mode/h2.2

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+#name : Header 2 (-)
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+${1:Header 2}
+${1:$(make-string (string-width text) ?\-)}
+
+$0

snippets/text-mode/markdown-mode/h3

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+#name : Header 3
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+### ${1:Header 3} ###
+
+$0

snippets/text-mode/markdown-mode/h4

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+#name : Header 4
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+#### ${1:Header 4} ####
+
+$0

snippets/text-mode/markdown-mode/h5

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+#name : Header 5
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+##### ${1:Header 5} #####
+
+$0

snippets/text-mode/markdown-mode/h6

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+#name : Header 6
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+###### ${1:Header 6} ######
+
+$0

snippets/text-mode/markdown-mode/hr.1

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+#name : Horizontal Rule (-)
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+
+----------
+
+$0

snippets/text-mode/markdown-mode/hr.2

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+#name : Horizontal Rule (*)
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+
+*******
+
+$0

snippets/text-mode/markdown-mode/img

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+#name : Image
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+![${1:Alt Text}](${2:URL} $3) $0

snippets/text-mode/markdown-mode/link

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+#name : Link
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+[${1:Link Text}](${2:URL} $3) $0

snippets/text-mode/markdown-mode/ol

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+#name : Ordered List
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+${1:1}. ${2:Text}
+${1:$(number-to-string (1+ (string-to-number text)))}. $0

snippets/text-mode/markdown-mode/rimg

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+#name : Referenced Image
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+![${1:Alt Text}][$2] $0

snippets/text-mode/markdown-mode/rlb

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+#name : Reference Label
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+[${1:Reference}]: ${2:URL} $3
+$0

snippets/text-mode/markdown-mode/rlink

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+#name : Reference Link
+#contributor: Peng Deng <dengpeng@gmail.com>
+# --
+[${1:Link Text}][$2] $0