Add custom NER dataset

Custom_NER_dataset.txt

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+Money B-O
+transfer B-ACTIVITY
+from B-O
+my B-O
+checking B-PRODUCT
+account I-PRODUCT
+is B-O
+not B-O
+working B-O
+. O
+
+I B-O
+want B-O
+to B-O
+check B-ACTIVITY
+balance I-ACTIVITY
+in B-O
+my B-O
+savings B-PRODUCT
+account I-PRODUCT
+. O
+
+I B-O
+suspect B-O
+a B-O
+fraud B-ACTIVITY
+in B-O
+my B-O
+credit B-PRODUCT
+card I-PRODUCT
+account I-PRODUCT
+. O
+
+I B-O
+am B-O
+here B-O
+for B-O
+opening B-ACTIVITY
+a B-O
+new B-O
+savings B-PRODUCT
+account I-PRODUCT
+. O
+
+Your B-O
+mortgage B-PRODUCT
+is B-O
+in B-O
+delinquent B-ACTIVITY
+status I-ACTIVITY
+. O
+
+Your B-O
+credit B-PRODUCT
+card I-PRODUCT
+is B-O
+in B-O
+past B-ACTIVITY
+due I-ACTIVITY
+status I-ACTIVITY
+. O
+
+My B-O
+loan B-PRODUCT
+account I-PRODUCT
+is B-O
+still B-O
+not B-O
+approved B-ACTIVITY
+and B-O
+funded B-ACTIVITY
+. O
+
+How B-O
+do B-O
+I B-O
+open B-ACTIVITY
+a B-O
+new B-O
+loan B-PRODUCT
+account I-PRODUCT
+? O
+
+What B-O
+are B-O
+the B-O
+charges B-ACTIVITY
+on B-O
+Investment B-PRODUCT
+account I-PRODUCT
+? O
+
+Can B-O
+you B-O
+explain B-O
+late B-ACTIVITY
+charges I-ACTIVITY
+on B-O
+my B-O
+credit B-PRODUCT
+card I-PRODUCT
+? O