add journaling function

README.md

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+# NOTE
+functions that i use for taking notes
+
+
+## `journal()`
+use to enter a timestamped text entry to a file with the current date. will create the file if it does not exist. 

journal.shf

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+# ENV REQUIREMENTS:
+# - JOURNALDIR: default journal directory
+
+function journal() {
+    if [ ! -d "${JOURNALDIR}" ]; then
+        mkdir -p "${JOURNALDIR}"
+    fi
+    FILE="${JOURNALDIR}$(date '+%Y-%m-%d')"
+    echo "${FILE}"
+    if [ ! -f $FILE ]; then
+        echo "$(date '+%Y-%m-%d')\n" >> $FILE
+    else
+        echo "\n" >> $FILE
+    fi
+    echo ">> $(date '+%H:%M:%S')" >> $FILE
+    vim +$ ${FILE}
+}